SED command

Hi All,

Does somone knows how can i replace entire line with sed command?

for exmple: i have afile

a=1
b=2
c=3

i need to find the "b" sring and then to replace the whole line "b=2" with "ghost".

Thanks,

sed 's/b=2/ghost/' filename

You need to pu the output in a tem variable/file, if you use sed version 4 (or higher) you can use the -i option to put the output in the input file (like -o with sort: sort somefile -o somefile).

Sed 4+ example:
sed -i 's/b=2/ghost' filename

Hope this helps.