March 2002
Beginner
504 pages
10h 47m
English
Content preview from Sams Teach Yourself Shell Programming in 24 Hours, Second Edition
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How Are Signals Represented?
In UNIX, every type of event that can occur is represented by a separate signal. Every signal is a small positive integer. The signals most commonly encountered in shell script programming are given in Table 19.1. The signals are available on all versions of UNIX.
| Name | Value | Description |
|---|---|---|
| SIGHUP | 1 | Hangup detected on controlling terminal or death of controlling process |
| SIGINT | 2 | Interrupt from keyboard |
| SIGQUIT | 3 | Quit from keyboard |
| SIGKILL | 9 | Kill signal |
| SIGALRM | 14 | Alarm Clock signal (used for timers) |
| SIGTERM | 15 | Termination signal |
In addition to the signals listed in Table 19.1, you might see a reference to signal 0. This signal is more of a shell convention than a real signal. ...
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