I always forget these commands, and they are so useful.
The sed command to replace some text in a set of files:
sed -e 's/old text/new text/g' -i .trash *.c
The regular expression 's/some text/new text/g' is applied to each line of each file *.c.
And the -i flag saves a backup of each file.
The regular expression language is powerful, for instance allows to remember parts of the pattern in the substitution. An example: the following command puts quotation marks around everything that follows the first = sign in each line of script.sh.
sed -e 's/=\(.*\)/="\1"/' script.sh
The pattern enclosed between \( and \) is stored in \1, and then used in the replaced text.
Source: http://www.labnol.org/internet/design/wordpress-unix-replace-text-multiple-files/1128/
The sed command to replace some text in a set of files:
sed -e 's/old text/new text/g' -i .trash *.c
The regular expression 's/some text/new text/g' is applied to each line of each file *.c.
And the -i flag saves a backup of each file.
The regular expression language is powerful, for instance allows to remember parts of the pattern in the substitution. An example: the following command puts quotation marks around everything that follows the first = sign in each line of script.sh.
sed -e 's/=\(.*\)/="\1"/' script.sh
The pattern enclosed between \( and \) is stored in \1, and then used in the replaced text.
Source: http://www.labnol.org/internet/design/wordpress-unix-replace-text-multiple-files/1128/
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