What is the purpose of -e in sed command? - Unix & Linux Stack …
2015年6月3日 · In the help for sed you will find that -e flag stands for:-e script, --expression=script add the script to the commands to be executed You are not the first to be confused after encountering -e. In your example sed 's/foo/bar/' and sed -e 's/foo/bar/' are equivalent. In both cases s/foo/bar/ is the script that is
command line - What is sed and what is it used for? - Ask Ubuntu
The sed utility is a batch (noninteractive) editor. The sed commands are usually stored in a script-file . . .although you can give simple sed commands from the command line . . . Man page for sed (GNU sed) 4.2.2 : Sed is a stream editor.
Simplest way to comment/uncomment certain lines using …
2014年5月9日 · To make the command that you wanted, just put the above into a shell script called comment: #!/bin/sh sed -i "$1"' s/^/#/' "$2" This script is used the same as yours with the exception that the first and last lines are to be separated by a comma rather than a dash. For example: comment 2,4 bla.conf An uncomment command can be created analogously.
How to embed a shell command into a sed expression?
The keyword gets quoted, and the value not. I pass the option e - which is GNU specific - to the s command, which tells sed to execute the result of the substitution as a shell command and read its results into the pattern buffer (Even multiple lines). Using the option p after(!) e makes sed printing the pattern buffer after the command has ...
sed - How to insert text before the first line of a file? - Unix ...
Use sed's insert (i) option which will insert the text in the preceding line. sed '1 i\ Question author's update: To make it edit the file in place - with GNU sed - I had to add the -i option: sed -i '1 i\anything' file Also syntax. sed -i '1i text' filename For non-GNU sed
How do I call a sed command in a python script? - Ask Ubuntu
2016年3月18日 · Through python script, I am trying to replace a string by a string in a file using sed command. I do that through subprocess.call as it in the script. When I run the command in the shell script or command, it runs fine, but in python I get a result saying "No input file".
Any way to have a "verbose mode" or "debug mode" with sed?
2019年1月6日 · The debug output will print a line starting with "MATCHED" every time it matches a regex command, and that's the 4th line of a 8 total per match telling you what sed did. So including -B 3 -A 4 will print just the groups of lines where sed is actually making a change, and won't print the 8 lines for every input line where nothing changed.
SED: insert text after the last line? - Unix & Linux Stack Exchange
2019年11月3日 · sed -i (edit file in place) '$ (when at the end of the file) s (sed command for search and replace, searches with regexp like so s/findme/replacewth/) so s/$ ($ regex end of line) /\n?>/ the replacewith is \n?> so replace the end of the line with (newline ?> which is a closing tag for php
bash - How do I use variables in a sed command? - Ask Ubuntu
The shell then runs the above command sed with the next arguments (assuming pattern=bert and file=text.txt): -i s,bert,Say hurrah to &: \0/, text.txt If file.txt contains bert , the output will be:
Can sed replace new line characters? - Unix & Linux Stack Exchange
Is there an issue with sed and new line character? I have a file test.txt with the following contents aaaaa bbbbb ccccc ddddd The following does not work: sed -r -i 's/\\n/,/g' test.txt ...