LinuxQuestions.org - linux-related notes

Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.

N00b method to toggle some verbosity on command for bash scripts

Posted 03-28-2016 at 11:32 PM by the dsc (linux-related notes)
Updated 03-28-2016 at 11:34 PM by the dsc

Tags bash, newbie

Just something I came up with that is probably not how actual programmers/scripters(?) would advise, specially the parameter/flag thing which is beside the point here.

Code:

if [[ $1 == "v" ]] ; then

ver(){
echo $@
}

else

ver(){
:    # ":" is a "do nothing" command
}

fi

a=10

echo normal output

ver verbose output $a

...

the dsc

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New file name generator script/function, to avoid overwrites w/o user input

Posted 03-27-2016 at 07:11 PM by the dsc (linux-related notes)

Tags bash, function, script

Usage examples:

cp/mv/ln/etc file11.txt $(newname "/some/path/file11.txt")

cp/mv/ln/etc file11.txt $(newname "/some/path/whatever.txt")

If there's a file11.txt or whatever.txt already there, it will rename automatically to file11(1).txt or whatever(1).txt, and (N+1) from then on.

The whole path/name must be between quotes because of spaces and such things.

May be dangerous and somehow make you lose files...

the dsc

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Parsing script arguments in bash, without getopt(s)

Posted 03-12-2016 at 05:15 PM by the dsc (linux-related notes)

Tags arguments, bash

Nifty. Just found that on stackoverflow:

http://stackoverflow.com/questions/1...uments-in-bash

Quote:

Originally Posted by Bruno Bronosky, cwd, et al.

Preferred Method: Using straight bash without getopt[s]

I originally answered the question as the OP asked. This Q/A is getting a lot of attention, so I should also offer the non-magic way to do this. I'm going to expand upon guneysus's answer to fix the nasty sed and include Tobias Kienzler's suggestion.

Two

...

the dsc

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Make a bash script recognize bash aliases

Posted 05-12-2015 at 04:16 PM by the dsc (linux-related notes)
Updated 05-12-2015 at 04:22 PM by the dsc (mismatched tags)

Tags aliases, bash, script

Say, if you have a script that would take as a parameter something that you have aliased, it wouldn't work.

I mean:

$ ./script.sh myalias whatever else
/home/dude/scripts/script.sh: line 3: myalias: command not found

In order to make it work, the said script must include:

Code:

shopt -s expand_aliases
source ~/.bash_aliases

(Or wherever your aliases are set, which would preferably be...

the dsc

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[bash] "keep trying" command, even if exits with error, for at least 10 times

Posted 08-08-2014 at 10:40 PM by the dsc (linux-related notes)
Updated 08-08-2014 at 10:42 PM by the dsc

Tags bash

A script that tries to run a given arbitrary command N times, or until it exits with success. The commented parts are aborted attempts to make it figure whether the first parameter is a number instead of a command, and that would be used as the maximum number of attempts. Something went wrong, sometime I'll try to figure it out.

Quote:

#!/bin/bash
#input="$@"
# this program is stupid. It's declared to be in public domain by its author, who whishes to remain anonymous

...

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