linux substitute string
#replace all string occurence
sed -i 's/old-text/new-text/g' input.txt
#replace all string occurence and create new file
sed -i 's/old-text/new-text/g' input.txt > newfile.txt
#see link
#https://www.cyberciti.biz/faq/how-to-use-sed-to-find-and-replace-text-in-files-in-linux-unix-shell/replace substring in shell
#To replace the first occurrence of a pattern with a given string,
#use ${parameter/pattern/string}:
#!/bin/bash
firstString="I love Suzi and Marry"
secondString="Sara"
echo "${firstString/Suzi/$secondString}"
# prints 'I love Sara and Marry'
#To replace all occurrences, use ${parameter//pattern/string}:
message='The secret code is 12345'
echo "${message//[0-9]/X}"
# prints 'The secret code is XXXXX'
#(This is documented in the Bash Reference Manual, §3.5.3 "Shell Parameter Expansion".)Copyright © 2021 Codeinu
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