====== Sed ======

= SED - Stream Editor: Edit files via bash =

====== Example of replacing text ======
 sed -i "s/wordtoreplace/wordtoreplacewith/" /path/to/file/file.txt
 
 # -i = Edit File in place
 # s/ = s/regexp/replacement/ (search regexp and replace)

====== Replace all instances of text in a line ======
 echo "teztz" | sed "s/z/-/"
The above sed will *NOT* replace ALL instances of z with -. The following instead is required:
 echo "teztz" | sed "s/z/-/g"
 #The /g is required to replace all instances.

====== Replace a Forward Slash (/) using sed ======
The following situation:
A script outputs the following:
 /home/user1
 /home/user2
 /home/user3
Using [[Munin_Statistics]], I want to be able to graph disk usage. The above string cannot be used to create a file for disk usage. I want to replace all instances of / with -.
 du -B 1 --max-depth=1 /home | sed "s/\<nowiki>//</nowiki>-/g"
The trick is to escape the / with a \.



====== Replace urls in files ======
 find . -type f -iname "*.php" -exec sed -i "s|www.website.ie/~user1|www.website2.ie/~user2|" {} \;
 #the pipe | is used to delimit sed

====== Delete text in files ======
 sed -i "/wordtodelete/d" text.txt
 #the /d is for delete instead of replace.

====== Other information about sed ======
 man sed