Sed replace a text with a variable of output of command

Sometimes we need to replace a string with a variable or output of a Linux command we can use Sed in following way to do that

sed -i "s/textTOreplace/${variablename}/g" /file_path

If you also want a backup of the original file to be created after replacement that you can use .bak after -i parameter as follows:

sed -i.bak "s/textTOreplace/${variablename}/g" /file_path

Replace a word in file Linux Shell

sed -i 's/<word to replace>/<new word>/g'<filenametobereplacedin>

Eg:

sed -i 's/shashwat/shriparv/g'shashwat.txt