May 2000
Beginner
761 pages
18h 20m
English
Content preview from Linux Shells by Example
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9.13. Shell Built-In Commands
The shell has a number of commands that are built-in to its source code. Because the commands are built-in, the shell doesn't have to locate them on disk, making execution much faster. The help feature provided with bash give you online help for any built-in command. The built-in commands are listed in Table 9.12 on page 481.
| Command | What It Does |
|---|---|
| : | Do-nothing command; returns exit status zero. |
| . file | The dot command reads and executes command from file. |
| break [n] | See the looping commands on page 443. |
| : | Do-nothing command; returns 0 exit status. |
| . | Executes program in context of current process; same as source. |
| alias | Lists and creates "nicknames" for existing commands. |
| bg | Puts a job in the background. ... |
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