non-interactive command-line text editor
Sed is a non-interactive command-line text editor. A stream editor is used to per-form basic text transformations on an input stream (a file or input from a pipeline).
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Root crontab files used to schedule the execution of programs
A crontab file contains instructions to the cron daemon of the general form: 'run this command at this time on this date'. Each user has their own crontab, and com- mands in any given crontab will be executed as the user who owns the crontab.
Bash is the GNU Project's shell. Bash is the Bourne Again SHell. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use. In addition, most sh scripts can be run by Bash without modification.