398
edits
Changes
Sed
,Undo revision 1837 by [[Special:Contributions/imported>Pew|imported>Pew]] ([[User talk:imported>Pew|talk]])
'''Sed''' is an extremely handy commandline *nix tool. Refer to its manual page for a more extensive overview of its capabilities. =Uses===Substitution==The most popular command of sed is the <code>s</code> command for substitution. To use the command, type an s, followed by a delimiting character, followed by a regular expression to look for, followed by the delimiting character, followed by an expression with which to replace what was found, followed by a final delimiting character. (<code>/</code> is the conventional delimiting character and potentially required by some versions of sed. GNU sed can take any character however, and when URLs or paths are involved, <code>%</code> is often a handy choice to lessen the amount of escaping required.)<pre>$ echo "Never let schooling interfere with your education." | sed 's/schooling/video games/'Never let video games interfere with your education.</pre> Groups can be useful in the replacement portion. Use the <code>-r</code> flag if you don't want to escape the initial grouping parenthesis. The <code>-e</code> flag allows for multiple expressions to be evaluated.<pre>$ echo "Never let schooling interfere with your education." | sed -re 's/(schooling)/costly \1/' -e 's/(education)/invaluable \1/'Never let costly schooling interfere with your invaluable education.</pre> =Examples=* [[Reencoding MediaWiki pages#Script]]* [[Central Authentication System#Scripted Login]] [[Category:Software]][[Category:Pending deletionHowtos]]
