Jun 02, 2005
Grep and Sed Tips
I'm terrible at this type of thing so I need lots of examples
Simple 'sed' Example
sed '3,10s/REGEXP/replacement' book
Will search the file 'book' and replace 'REGEXP' with 'replacement' on the third and tenth lines only.
Some more simple examples
sed 's/red/green'
Replaces the first occurrence of 'red' in a line with 'green'
sed 's/red/green/4'
Replaces the fourth occurrence of 'red' in a line with 'green'
sed 'car/!s/red/green/g'
Replaces all instances of 'red' with 'green' except in lines containing the word 'car'
Simple 'grep' Example
Find a matching phone number
grep '408.[0-9]\{3\}.[0-9]\{4\}' mail/*
Will search all files in the mail directory for a pattern which will match 408<'.' = any single character><[0-9]\{3\} = three digit number><'.' = any single character><[0-9]\{4\} = four digit number>
Note the use of '\' to escape (ignore) the following special character '{' and '}'
Permalink | 2005.06.02-03:46.00