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Full Discussion: Optimizing bash script
Top Forums Shell Programming and Scripting Optimizing bash script Post 302975521 by SkySmart on Tuesday 14th of June 2016 06:08:02 PM
Old 06-14-2016
Quote:
Originally Posted by stomp
Hi,

can you post sample input + output files? That will
make it easier.

stomp();

Here's some bash code, which should be a lot faster, because only shell builtins are used. Can be better if you bring samples(in/out) and explain them.

Code:
#!/bin/bash

shopt -s nocasematch 

NUMBER=${TMFR//[wdhmoWDHMO]/}

# default multiplier for MINUTES
MULTIPLIER=60

# order of the checks matters!
[[ "$TMFR" =~ mo ]] && MULTIPLIER=2592000 # MONTH
[[ "$TMFR" =~ w  ]] && MULTIPLIER=604800  # WEEK
[[ "$TMFR" =~ d  ]] && MULTIPLIER=86400   # DAY
[[ "$TMFR" =~ h  ]] && MULTIPLIER=3600    # HOUR

((FIRSTIN= $NUMBER * $MULTIPLIER))

echo $FIRSTIN $NUMBER $MULTIPLIER

thank you so much for this.
one question, this uses the newer functions of bash, i dont think it would work on the old bash that uses sh. know how to make this more portable?
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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