Replace string inside multiple files

In modern linux systems:

~#cd /path/to/your/folder
~#sed -i 's/foo/bar/g' *

-i means inplace

or

rename 's/fgh/jkl/' fgh*

or

~#grep -rl "old_string" . | xargs sed -i 's/old_string/new_string/g'

• grep -rl: search recursively, and only print the files that contain “old_string”
• xargs: take the output of the grep command and make it the input of the next command (ie, the sed command)
• sed -i 's/old_string/new_string/g': search and replace, within each file, old_string by new_string

In Z/OS unix system: 1. Create a bash script as below and save it as (sed.sh):

#!/bin/sh                                 
sed "s/http/https/g" $1 > /changed/$1

1. Use find to find files and execute bash script for each file

~#find . -type f -exec /some/place/sed.sh {} \;