Some Useful UNIX Commands for a QA Tester

In a UNIX environment, a tester frequently involves in -
Running scripts as per test case step requirement.
File manipulation (copying/renaming/deleting)
Navigation (change directory/listing files/dictionary)
File/directory creating
Monitoring
remote log in
Using VI/others editors
Search command  grep, find
 The find command is used to search the UNIX system for specific files and/or directories.
 Executing scripts
Creating auto-run of script using cron-tab job