shell statement to modify txt file or sh file

The shell statement modifies the txt file or the sh file

Basic ideas, use regular expressions, find the target, replace the target, save the file

shell sed regular expression

regular expression

Option 1:

runScSparkFilename="runScSpark.sh"sed -i "s/$search/$replace/" $filename

Option 2:

$ cat /etc/syslog.conf | sed -n '/^[[:alpha:]]/p'authpriv.* /var/log/secure