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Shell Scripting

Shell Scripting - Shell Scripting Shell Programs Shells are...

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Shell Scripting
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Shell Programs Shells are programs used to interact with a computer using a command line. They used to be the only way that users could interact with the computer. Now there are Graphical Shells like Gnome, KDE, Windows Explorer, Macintosh Finder, etc that offer similar functionality. GUI Shells can do many of the tasks of command line shells but not all of them. Shells are used to make many administration procedures automatic: backup, program installation, Web services.
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Shell Programs When a command runs, the OS checks first if the file is an executable file with a known format (ELF, a.out). If it is not, then it checks the first line for a “#! interpreter-program”, if it is there, then it runs the interpreter program and passes the file as input. In any case, a command needs to have the execute permissions set to be able to run.
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Shell Programs /bin/sh – Standard UNIX Shell /bin/ksh – Korn shell (more powerful) /bin/bash – GNU shell /bin/tcsh – Some line editing.
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