sed In-Place Editing Replacing strings in a file in-place
Example
sed -i s/"what to replace"/"with what to replace"/g $file
We use -i to select in-place editing on the $file file.
In some systems it is required to add suffix after -i flag which will be used to create backup of original file. You can add empty string like -i '' to omit the backup creation. Look at Remarks in this topic about -i option.
The g terminator means do a global find/replace in each line.
$ cat example
one
two
three
total
$ sed -i s/"t"/"g"/g example
$ cat example
one
gwo
ghree
gogal
