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16 Février 2021
Ever wondered how to edit multiple files with a single script? Well I did, and I am sure everyone who is reading this post must have. 🙂 Imagine there are hundreds of files (for e.g., signatures of all the employees) and you were asked to edit (eg., name of the company) all the signatures. It takes a great amount of time if we manually edit them individually. Well, the answer for our problem is a single batch script that can take care of our problem with just one click. Here's an example:
You can edit the file, move to the offending text, go into Insert mode, delete the bad text, type the correct letters, and then save and quit the file. Here are the steps: 1 Select the file by typing vi index.php at the command line. This allows you to choose which file you need to edit. We can: 1) open up a text file; 2) read the text into a variable; 3) do a search-and-replace on that variable; and 4) re-save the text file. We can even do all that from the command line, although we'll hold off on that for a moment. Instead, let's start with a simple script that carries out the search and replace.
1.Open Notepad, Copy and paste the below script :
New-Item cmdlet is used to create a text file and Set-Content cmdlet to put content into it. In this example, we're creating a new text file named test.txt. Type the following command in PowerShell ISE Console. New-Item D:temptesttest.txt You can see the test.txt created in D:temptest directory. This batch allows string substitution in a text file. It parses each line of a text file for a particular string and replaces it with another string. To replace all occurrences of 'Yellow Submarine' in 'color.txt' with 'uboot' and put the output on the screen run: BatchSubstitute.bat 'Yellow Submarine' uboot color.txt Or.
@echo off
REM — Prepare the Command Processor —
SETLOCAL ENABLEEXTENSIONS
SETLOCAL DISABLEDELAYEDEXPANSION
::BatchSubstitude – parses a File line by line and replaces a substring'
::syntax: BatchSubstitude.bat OldStr NewStr File
:: OldStr [in] – string to be replaced
:: NewStr [in] – string to replace with
:: File [in] – file to be parsed
if '%*''' findstr '^::' '%~f0″&GOTO:EOF
for /f 'tokens=1,* delims=]' %%A in (‘'type %3|find /n /v '''‘) do (
set 'line=%%B'
if defined line (
call set 'line=echo.%%line:%~1=%~2%%'
for /f 'delims=' %%X in (‘'echo.'%%line%%''‘) do %%~X
) ELSE echo.
)
2. Save the file as 'xyz.bat'
The above script will parses a file line by line and will replaces a desired substring.
3. Open cmd prompt >> type the following command:
c:xyz.bat 'text-to-replace' text-to-replace-with c:FileToEdit.txt > c:Edited_file.txt
xyz.bat is the batch script we have created in Step 1; FileToEdit.txt is the file you would like to edit; and Edited_File.txt is an edited file.
The command will edit the file (FileToEdit.txt) and output into a new file (Edited_File.txt).
Output - Edited file
This script can also edit an htlml file. I haven't tried the script on other file formats (e.g., .aspx, .rtf, etc…). If anyone did, then please let me know if it works.
The only drawback of this script is, it cannot recognize the spaces in a string. https://coolofiles856.weebly.com/slotastic-casino-no-deposit-bonus-codes.html. I wasn't able to figure out how to edit a complete sentence. Instead I used a lengthy but effective way to edit 2 or more strings in a file. Try the following script:
c:xyz.bat 'First-string-to-replace' string-to-replace-with c:FileToEdit.txt > c:Edited_temp.txt
'The above command will replace the first substring and output into ‘Edited_temp.txt' file.'
c:xyz.bat 'Second-string-to-replace' string-to-replace-with c:Edited_temp.txt > c:Edited_final_file.txt
'The above command will replace the second substring from ‘Edited_temp.txt' file and output into a new file i.e., ‘Edited_final_file.txt' '
del c:Edited_temp.txt
'It will delete the ‘Edited_temp.txt' file'
Do let me know, if anyone figured out how to replace a complete sentence using a single command line.
You can furhter manipulate the script accordingly to add any conditional statements etc… Hope this article helps. 🙂
Tip of the day: Test all your batch scripts in a Virtual machine. To know how to create a virtual machine, please visit http://technet.microsoft.com/en-us/library/cc708299(WS.10).aspx
Rule of the day: Do you understand the value of consistency?
Author: Syed Dilawer Mehdi – Software Developer/Network Administrator
Part 3 Using Vim
Lesson 2: Editing with vi
Part 4 Using Emacs
Edit a file as the root user. Editing files as the root user is potentially dangerous, and may break your system in bad ways. Take great care when editing files as the root user. Using the sudo command, you will need to successfully enter your password before gedit will open.
Edit the file with vim:
To use the command line to create a new, blank text file, press Ctrl + Alt + T to open a Terminal window. Type the following command and press Enter. Change the path and the file name (~/Documents/TextFiles/MyTextFile.txt) to what you want to use.
Using ‘vim' to create and edit a file
To open a file in the vi editor to start editing, simply type in ‘vi
How to Save a File in Vi / Vim Editor in Linux
How to edit file using vi utility on Linux?
Run the .sh file. To run the .sh file (in Linux and iOS) in command line, just follow these two steps: open a terminal (Ctrl+Alt+T), then go in the unzipped folder (using the command cd /your_url) run the file with the following command.
In Linux, you can easily change the file permissions by right-clicking the file or folder and select 'Properties'. There will be a Permission tab where you can change the file permissions. In the terminal, the command to use to change file permission is ' chmod '.
Tips
Steps to Setting Up Aliases in the bash-shell
How to Edit a Configuration File in Windows
How to edit PDF files:
Searching and Replacing in vi
Renaming files with 'mv' Command. A simple way to rename files and folders is with the mv command (shortened from 'move'). Its primary purpose is moving files and folders, but it can also rename them, since the act of renaming a file is interpreted by the filesystem as moving it from one name to another.
To quit the vi editor without saving any changes you've made:
How to edit a read only file in Linux ?
When you want to run functions from your command line, this is a must-have.
mv command is used to move files and directories.
To get into it, press Esc and then : (the colon). The cursor will go to the bottom of the screen at a colon prompt. Write your file by entering :w and quit by entering :q . You can combine these to save and exit by entering :wq .
To find a word in Vi/Vim, simply type the / or ? key, followed by the word you're searching for. Once found, you can press the n key to go directly to the next occurrence of the word. Vi/Vim also allows you to launch a search on the word over which your cursor is positioned.
Installing VIM editor is pretty easy, it just require a single command to install. The following command is used to install VIM editor. Type ‘Y' and press enter, it will start installation of required packages and application. After that, we can run vim either from the terminal or application manager.
How to Modify Permissions with chmod
To change the owner of a file use the chown command followed by the user name of the new owner and the target file. If a numeric owner exists as a user name, then the ownership will be transferred to the user name. Down to you trailer.
chmod +x adds the execute permission for all users to the existing permissions. chmod 755 sets the 755 permission for a file. 755 means full permissions for the owner and read and execute permission for others.
Assuming you installed Sublime in the Applications folder, the following command should open up the editor when you type it into the Terminal:
First, open the Terminal, then mark the file as executable with the chmod command. Now you can execute the file in the terminal. If an error message including a problem such as ‘permission denied' appears, use sudo to run it as root (admin).
Steps
Photo in the article by 'Wikimedia Commons' https://commons.wikimedia.org/wiki/File:Grim-text-editor-Kali_Linux.png
Fast editing examples using cat, ed, and sed
Most UNIX® developers settle on Emacs, vi, or one of the many variants, offshoots, and clones of these two text-editing applications. Files are normally opened in the editor of choice, and changes are interactively specified and applied to the file by the operator.
But you can often do an editing job at the command line more quickly than it takes to open the file in a text editor. A complex editing procedure can be programmed and specified from the command line and executed across multiple files, eliminating all unnecessary screen display, cursor motion, and manual interaction with the files. A good tactic is to keep a cache of relevant one-liners on hand to do common editing jobs. Not only do they save you time, especially in batch operations involving multiple files, but you can also use them in scripts.
One-liners for editing and processing text are a famous tradition in the Perl and AWK (and lately Ruby) languages and, of course, the shell. This article demonstrates basic text-editing techniques with three of the most primary command-line editing tools readily available on all systems: cat, ed, and sed. The editing examples that follow start with the simplest and most common constructs and work up to the more complex.
Use cat, whose name stands for together, to concatenate files and standard input streams, as in Listing 1. The slackers of the world also use it as a general pager (cat file) and a complete text-editing environment (cat > file). Its syntax is unrivaled in its simplicity and, for text editing one-liners, it gives you quick ways to append or insert text without an editor.
cat to concatenate files and standard input streamsThe slackers are on to something, though. When you need to append text to the end of a file, there's nothing quicker than cat:
While you're adding lines, pressing Ctrl-U erases the current line, Ctrl-Z suspends the process, and Ctrl-C aborts everything. When you're done, press Ctrl-D on a line of its own. (These are some of the default Korn shell control keys, but they work for most shells and editing modes.)
If the data you're entering is an X selection that you're pasting from another window, this one-liner is generally quicker to use than calling up an editor, opening the target file, moving to the end of the file, pasting the selection, saving the file, and exiting the editor. It can also be more useful when you're pasting formatted or specially formatted text, and you want to keep the formatting because some text editors and editing modes reformat the X selection when you paste it.
Although this operation is a common, everyday practice, you always have to be careful that you use the shell operator for appending redirection (>>) and not the regular redirection operator (>); if you mistakenly use the latter, you'll overwrite the contents of the file with the text you mean to append.
https://coolofiles856.weebly.com/jupiter-club-no-deposit.html. To add the entire contents of one file to the end of another file, give the filename:
If you're appending only a single line instead of multiple lines or an entire file, you can use echo instead of cat:
To append lines of text that are itemized beginning with 1, use cat's -n option; lines are preceded with the line number (offset with up to five space characters) and a tab character. Add the -b option to suppress the numbering of blank lines:
You can insert text at the beginning of a file with cat by specifying the standard input with a hyphen (-) and writing to a new file:
Although it's simple, the disadvantage of this one-liner is that it creates a new file. If you want to insert text into the original file, the renaming shuffle you have to do makes this almost more trouble than it's worth. Better ways are just ahead with ed.
cat has several useful options. Some of them control the way it outputs nonprintingcharacters, such as tabs and control characters. To determine whether a file or a group of text files has embedded control characters, use these options. For instance, if a file has trailing blanks, you can see them:
These options differ according to your UNIX implementation; Table 1 gives the standard IBM AIX® operating system options.
cat| Option | Description |
|---|---|
-b | Don't number blank lines. |
-e | Show the end of line with a $character. |
-n | Number all lines of output, beginning with 1. |
-q | Use quiet operation (suppress error messages). |
-r | Replace all multiple empty lines with a single line ('squeeze'blanks). |
-S | Squeeze multiple blank lines together into a single line (same as-r). |
-s | Suppress error messages (quiet operation). |
-t | Show tab characters as ^I. |
-u | Don't buffer output. |
-v | Show nonprinting control characters visibly. |
As its name implies, the line editor, ed, performs edits on lines of input files. Itreads entire files into its own buffer, makes the specified operations on that copy, and optionally writes the buffer to disk. You can specify any number of lines in an editing operation, and these operations can be combined and given in a series. These facts make ed an excellent choice for use in scripts. Specify an operation in this format:
The address specifies the line or lines to work on (the default is the current line), and it can be given in a number of ways. The single-character command is the action to perform on the specified lines. For ad hoc one-liners in scripts, use ed noninteractively by piping a group of commands and text to it with echo:
If text is input in an operation, a period (.) should be echoed to indicate the end of input. The final wq writes the file and quits. The -s option makes ed behave silently and suppresses all normal output.
Fortunately, ed's basic addressing methods and commands are fairly standardized. The major forms of addressing are described in Table 2. Commands are given in Table 3.
ed| Option | Description |
|---|---|
. | This option addresses the current line (the default address). |
number | This option addresses the line number. Lines might be addresses in a range,separated by a comma (first,last). 0 addresses thebeginning of the buffer (before the first line). |
-number | This option addresses the line number lines before the current line.Without number, the minus addresses the line immediatelypreceding the current line. |
+number | This option addresses the line number lines after the current line.Without number, the plus addresses the line immediatelyafter the current line. |
$ | This option addresses the last line. |
, | This option addresses the first through the last line, inclusive (same as1,$). |
; | This option addresses the current line through the last line. |
/pattern/ | This option addresses the next line containing the text that matchespattern. |
?pattern? | This option addresses the previous line containing the text that matchespattern. |
ed commands| Command | Description |
|---|---|
a | This command appends text after the specified address. |
c | This command changes the specified address to the given text. |
d | This command deletes the addressed lines. |
i | This command inserts text before the specified address. |
q | This command quits the program and exits, as long as the buffer is saved todisk. |
r file | This command reads the contents of filespec and inserts it after thespecified address. |
s/pattern/replacement/ | This command substitutes text matched by pattern, with replacementtext in the specified address. |
w file | This command writes the specified address to file. With no address, this commanduses a default of the entire buffer. |
You can easily insert text at the beginning of a file with a scriptable ed one-liner. The insertion is made with ed appending the given text at line 0 (the beginning of the file), with the a command:
You can do the same thing interactively: Free games for my phone.
To insert the contents of another file at the beginning of the file, use the r command:
You can use ed to insert any number of lines of text before or after any line in the file. To insert after the first line containing a given string, enclose the string in slashes and follow it with the a command to append the text that follows. As before, end with a period on a lineof its own, and use wq to write the file and quit.
This technique comes in handy when you want to append a block of text at a particular place in a file:
It's also useful when you're making a multiline text insertion into a group of files. If you have a lot of lines to insert, use a here document, which is a document that's specified inline with << and a limit string, redirecting all input that follows it until the limit string is reached(see Related topics):
You can insert a file after a given string:
Use the d command to delete lines from the file. As with all commands discussed here, you can specify any kind of valid address, such as a particular line orrange of lines. In practice, this one-liner is generally most useful in conjunction with at least one matched pattern, such as deleting lines beginning with the first line matches some pattern to the end of the file:
You can do the inverse and delete everything from the first line of the file until the first line matches some pattern:
You can remove trailing blanks from a file by using the s command and substituting a null replacement:
The most complex and powerful of editing tools discussed here is sed (Stream EDitor). It's a text editor, but unlike file editors such as ed, it edits the input stream and writes to the output stream. Therefore, it's useful for editing command output or for when you're preprocessing a file with other tools -- you can then pipe that text output straight to sed for quick editing. But sed can also operate on files, and its scripting language has advanced pattern-matching capabilities, so it's a great choice for performing any kind of fast text edits -- such as a quick search and replace across a group of files. In fact, it's one of the most popular command-line tools in existence for text editing operations.
sed takes a script of any number of commands followed by an optional input filespec; by default, it reads standard input. Some versions of sed havean -i option, which specifies that the input file should be edited. (Without the option, the input file is read from, but it is not written to.) If your installed version supports this option, you should use it -- it lets you perform swift editing operations on any given filespec with a single command:
The following examples assume your sed has -i. Otherwise, you have to do the temp-file shuffle using shell redirection to save the output to a new file and renaming the new to the old in another step:
And with multiple files, you then have to loop:
You can use the s/searchstring/replacestring/ construct to replace a given string with another. To replace the first occurrence of old on every line in a file, use the following:
To replace every occurrence, append g to the search. This technique is good for fixing a typo or otherwise replacing a recurring word, phrase, or other string in a file or group of files:
You can bracket characters in the input expression but, if you use brackets in the replacement text, they're treated as regular characters:
When the slash character is part of the phrase to search or replace, define a new delimiter by using it:
You can also replace an entire line that contains a pattern with some new text:
Recall the example of brackets grouping characters together in a pattern and how they were taken as literal characters in the replacement text. What if you want to include the literal matched pattern in the replacement text? You can do this with an ampersand (&). This approach is useful for editing amatched pattern by putting text before or after it:
Use the a command to add a line of text after a given matched pattern:
This doesn't replace the text matched by the pattern -- it only adds the text after the first line that contains that pattern.
To insert text at the beginning of each line, match the caret metacharacter and supply the text to insert. Here's how to add e-mail style quotations to all lines in a file:
Cloud for pc download. The same principle applies to inserting text at the end of each line -- match the dollar-sign metacharacter and supply the text to insert. Here's how to emulate AIX cat's -vet options to mark trailing blanks:
The d command deletes given lines. You can precede it with a line number, range, pattern to match, or enclosed in slashes.
To delete the first line in a file:
To delete lines 1 through 10:
To delete all the lines between the first instance of the 'BEGIN QUOTE' string and the first instance of the 'END QUOTE' string:
To delete all sections of text whose first line contains '
To delete from the first line until the first blank line:
(When used on e-mail messages or Usenet articles, the preceding one-liner strips out all headers.)
To delete all lines beginning with e-mail style quotations:
To delete the last line of a file:
If lines of a file contain trailing space characters that you need to clean up, it can be cumbersome to manually find and edit them out in a text editor -- but with sed, doing so is a swift one-line operation. You search for a literal space character that occurs one or more times before the end of a line, and replace it with the empty set:
Text files can be edited in significant and complex ways without an editor by running one-liners from the UNIX command line. There are many good reasons why you would want to do so: for speed and convenience, for scriptability in cases where an interactive edit isn't possible or desirable, and sometimes to do complex edits on a single file or a group of files that would be difficult or even impossible to accomplish in your interactive application. This article demonstrated the concept with many simple text editing one-liners using three of the most ubiquitous of editing tools: cat, ed, and sed.
sed in conjunction with other command-line tools for powerful text processing.
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