sed

SED Cheat Sheet

Making a replace.sed file for replacing all occuring A with B in a file:

bash$ echo "1,"\$s":VALUE_A:_VALUE_B:g" >> replace.sed

bash$ sed -f replace.sed < currentfile > newfile

Getting Nth line in a text file:

bash$ sed -n '1~4p' somefile

This command will get every 4th line starting from line 1

Adding anything in from of the line:

bash$ sed 's/^/<ANYTHING>/'

Replacing the word enchantment with entrapment from line 1 to 10 in the myfile.txt:

bash$ sed -e '1,10s/enchantment/entrapment/g' myfile.txt

Search and replace within VI:

First occurrence on current line:

:s/OLD/NEW

Globally (all) on current line:

:s/OLD/NEW/g

Between two lines #,#:

:#,#s/OLD/NEW/g

Every occurrence in file:

:%s/OLD/NEW/g

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