Ubuntu – Execute permission while creating shell script

bashpermissionsscripts

Can I provide execute permission to a shell script while creating it for the first time?

I want a line of code which allows me to give execute permission to a file so that I can add that line inside the file itself. Assume that I know the filename beforehand.

Best Answer

Not sure if I understand you correctly, but if you want a script file that sets its own execution permission, you have to include this command:

chmod +x -- "$0"

The shell variable $0 always holds the name of the running script. Note the double quotes and double dash to protect misinterpretation of special file names.

However, to launch that script the first time, you need to call the interpreter with the script file as argument, like this:

bash example.sh

Related Solutions

Ubuntu – Simple script – execute command on selected file

You might also go for

!/bin/sh
gnome-terminal -x java -jar /home/askmoo/myfile.jar "$1"

in order to first open gnome terminal and then execute your java application in it. This way you would be able to get output printed out to the terminal.

Ubuntu – How to run an alias in a shell script

Some options:

In your shell script use the full path rather then an alias.

In your shell script, set a variable, different syntax

petsc='/home/your_user/petsc-3.2-p6/petsc-arch/bin/mpiexec'

$petsc myexecutable

Use a function in your script. Probably better if petsc is complex

function petsc () {
    command 1
    command 2
}

petsc myexecutable

Source your aliases

shopt -s expand_aliases
source /home/your_user/.bashrc

You probably do not want to source your .bashrc, so IMO one of the first 3 would be better.

Best Answer

Related Solutions

Ubuntu – Simple script – execute command on selected file

Ubuntu – How to run an alias in a shell script

Related Question