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The sed command is a common Linux command-line text processing utility. It's pretty convenient to process text files using this command. However, sometimes, the text we want the sed command to process is not in a file. Instead, it can be a literal string or saved in a shell variable.
How SED Works. In the syntax, you only need to provide a suitable “new string” name that you want to be placed with the “old string”. Of course, the old string name needs to be entered as well. Then, provide the file name in the place of “file_name” from where the old string will be found and replaced.
Use command substitution like this:
line=$(sed -n '2p' myfile)
echo "$line"
Also note that there is no space around the = sign.
In general,
variable=$(command)
or
variable=`command`
The latter one is the old syntax, prefer $(command).
Note: variable = .... means execute the command variable with the first argument =, the second ....
To store the third line into a variable, use below syntax:
variable=`echo "$1" | sed '3q;d' urfile`
To store the changed line into a variable, use below syntax:
variable=echo 'overflow' | sed -e "s/over/"OVER"/g"
output:OVERflow
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