Vyhledávání
Replace string in multiple files:
find /home/bruno/old-friends -type f -exec sed -i 's/ugly/beautiful/g' {} \;
Regexps
Works for both Perl and POSIX syntax. Some special symbols (),+, {i,j} must be escaped - see documentation.
> echo "one two" | sed "s/\s\+/," one,two
Group capturing
Group definition: [[:digit:]], group usage: \1
Example:
string='This is a sample 123 text and some 987 numbers'
echo "$string" | sed -rn 's/[^[:digit:]]*([[:digit:]]+)[^[:digit:]]+([[:digit:]]+)[^[:digit:]]*/\1 \2/p'
Differences on Mac (it has the obsolete BSD version):
- need to escape "(" and ")" for groups and "{" and "}" for occurence ranges
- "+" does not work - just star!
- example: sed -e 's/\([[:digit:]][[:digit:]]*\)/\1' instead of '(\d+)' pattern
- can not write TAB character (\t)
- best solution for Mac: installing GNU version:
- brew install coreutils gnu-sed
- it adds the "+", but it muset be escaped
- also add TAB and other metachard support
Some more tricks: http://www.brunolinux.com/02-The_Terminal/Find_and%20Replace_with_Sed.html