Adding option to my commands.

p4p1 [lexostras]
9 years ago

0

Hello, me again :P. So after making my own linux command that is cls (thx @dloser for the name :D ) I wanted to add options like -h to improve it but I have no idea how to do it.
My command is more of a bash script, here it is (the source code):
```

!/bin/sh

clear && ls –color
```
I saved this file in /sbin and added the chmod 755 to run it thx to @souvarine .
So if you don’t still understand this post, I am asking on how to add a -h option to my command without making a whole new thing.

Used to be lexostras…. but i got tierd of my name so now it’s worst…..
My github dont click this

5replies

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? [bolofecal]
9 years ago

0

```#!/bin/sh

until [ -z “$1” ]; do
if [ $1 = ‘-h’ ] || [ $1 = ‘–help’ ]; then
echo “put your text here”
exit 0
fi
shift
done

clear && ls –color```

?

? [bolofecal]
9 years ago | edited 9 years ago

0

You can increase others arguments like this:

```#!/bin/sh

until [ -z “$1” ]; do
if [ $1 = ‘-h’ ] || [ $1 = ‘–help’ ]; then
echo “put your text here”
exit 0
elif [ $1 = ‘-a’ ] || [ $1 = ‘–all’ ]; then
clear && ls -a –color
exit 0
else
echo “Unknow option \”$1\“”
exit 1
fi
shift
done

clear && ls –color```

$1 -> argument 1
$2 -> argument 2
…

This command takes one argument, a number. The positional parameters are shifted to the left by this number.

e.g.

yourcommand 1 2 3
shift
yourcommand 2 3
shift
yourcommand 3
shift
yourcommand

?

Mart
9 years ago

0

if you only want to add one or two flags that is ok but really you want to use “getopt” or similar

p4p1 [lexostras]
9 years ago | edited 9 years ago

0

thank you @Mart but I am not great in C for now :) I am actually learning it right now lol oh my bad, is getotp just for C or isnt it a thing to pass arguments in shell scripts??

Used to be lexostras…. but i got tierd of my name so now it’s worst…..
My github dont click this

Mart
9 years ago

0

getopt exists as a shell command, use “man getopt” to see what it does.

There are plenty of online tutorials for using it, e.g. http://wiki.bash-hackers.org/howto/getopts_tutorial

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