Advanced Bash scripting guide Rev1.4 by Cooper M.

By Cooper M.

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Example text

Tail /var/log/messages > $filename # /var/log/messages must have world read permission for this to work. " exit 0 See also Example 12-4, Example 12-30 and Example 30-6. grep A multi-purpose file search tool that uses regular expressions. It was originally a command/filter in the venerable ed line editor, g/re/p, that is, global - regular expression - print. ] Search the target file(s) for occurrences of pattern, where pattern may be literal text or a regular expression. txt The GPL governs the distribution of the Linux operating system.

Hwclock, clock The hwclock command accesses or adjusts the machine's hardware clock. Some options require root privileges. sysinit startup file uses hwclock to set the system time from the hardware clock at bootup. The clock command is a synonym for hwclock. html (4 of 4) [7/15/2002 6:33:49 PM] Next Text Processing Commands Complex Commands Advanced Bash-Scripting Guide: Chapter 12. 2. Complex Commands Commands for more advanced users find -exec COMMAND \; Carries out COMMAND on each file that find scores a hit on.

Fmt Simple-minded file formatter, used as a filter in a pipe to "wrap" long lines of text output. Example 12-19. Formatted file listing. /bin/bash WIDTH=40 # 40 columns wide. b=`ls /usr/local/bin` # Get a file listing... echo $b | fmt -w $WIDTH # Could also have been done by # echo $b | fold - -s -w $WIDTH exit 0 See also Example 12-4. edu/~amc/Par/. col This deceptively named filter removes reverse line feeds from an input stream. It also attempts to replace whitespace with equivalent tabs. The chief use of col is in filtering the output from certain text processing utilities, such as groff and tbl.

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