Multiple rename part of scripts

Shell Programming and Scripting
1

i have about 30 scripts for example:

test, test1,test2, test3, test4,.....

inside every scripte is code like this:

echo "input check OK"

how to rename this line in multiple scripts in this:

echo "input error!"
2

try:

perl -i -ne 's/check OK/error!/g;print;' test*
3

Below should do:


sed 's|check OK|error!|g' 

or

awk '{gsub("check OK","error!");print}'