Info Catalog grep: Environment Variables grep: Invoking grep: grep Programs

grep: Exit Status

 
 2.3 Exit Status
 ===============
 
 Normally the exit status is 0 if a line is selected, 1 if no lines were
 selected, and 2 if an error occurred.  However, if the ‘-q’ or ‘--quiet’
 or ‘--silent’ option is used and a line is selected, the exit status is
 0 even if an error occurred.  Other ‘grep’ implementations may exit with
 status greater than 2 on error.
 

Info Catalog grep: Environment Variables grep: Invoking grep: grep Programs