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Shell Programming and Scripting
Use parameter expansion over a parameter expansion in bash.
Post 303043413 by wisecracker on Tuesday 28th of January 2020 09:28:00 AM
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Hi ,
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Say you have this numeric variable that can be set by the user but you never want it to leave a certain range when it gets printed. How could you use parameter expansion such that it will never expand outside of that boundary? Thanks
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Hello experts,
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I have made the following examples that print various parameter expansions
text: iv-hhz-sac/hpac/hhz.d/iv.hpac..hhz.d.2016.250.070018.sac
(text%.*): iv-hhz-sac/hpac/hhz.d/iv.hpac..hhz.d.2016.250.070018
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#!/bin/bash
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Sample Data. This will be the response of the snmp query.
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Example data
$ ls *somehost*
10.10.10.10_somehost1.xyz.com.log
11.11.11.11_somehost2.xyz.com.log
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#FILES="*.log"
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do
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LEARN ABOUT FREEBSD
kldconfig
KLDCONFIG(8) BSD System Manager's Manual KLDCONFIG(8) NAME
kldconfig -- display or modify the kernel module search path SYNOPSIS
kldconfig [-dfimnUv] [-S sysctlname] [path ...] kldconfig -r DESCRIPTION
The kldconfig utility displays or modifies the search path used by the kernel when loading modules using the kldload(8) utility or the kldload(2) syscall. The following options are available: -d Remove the specified paths from the module search path. -f Do not display a diagnostic message if a path specified for adding is already present in the search path, or if a path specified for removing is not present in the search path. This may be useful in startup/shutdown scripts for adding a path to a file system which is still not mounted, or in shutdown scripts for unconditionally removing a path that may have been added during startup. -i Add the specified paths to the beginning of the search path, not to the end. This option can only be used when adding paths. -m Instead of replacing the module search path with the set of paths specified, ``merge'' in the new entries. -n Do not actually change the module search path. -r Display the current search path. This option cannot be used if any paths are also specified. -S sysctlname Specify the sysctl name to use instead of the default kern.module_path. -U ``Unique-ify'' the current search path - if any of the directories is repeated one or more times, only the first occurrence remains. This option implies -m. -v Verbose output: display the new module search path. If the path has been changed, and the -v flag is specified more than once, the old path is displayed as well. FILES
/boot/kernel, /boot/modules, /modules The default module search path used by the kernel. EXIT STATUS
The kldconfig utility exits 0 on success, and >0 if an error occurs. SEE ALSO
kldload(2), kldload(8), sysctl(8) HISTORY
The kldconfig utility first appeared in FreeBSD 4.4. AUTHORS
Peter Pentchev <roam@FreeBSD.org> BSD
June 15, 2001 BSD