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Shell Programming and Scripting
Shell scripting problem
Post 303008506 by alex4o0o on Saturday 2nd of December 2017 03:33:53 AM
12-02-2017
Shell scripting problem
Hello. I hava homework for university but i cant do it and i need a little help if someone can help me 
I have to do a linux shell script.
Write a script that does the following:
1. Check if there is a directory in / home with myDir name.
If not, it creates it.
2. In the directory it creates a new myFile file, checking if the user,
triggered the script, has write permissions on that file, if it does not, it outputs
Error message.
3. If there is, record the names, faculty numbers, and group of the file in the file
team members.
4. Shows the contents of the file on the screen by numbering the rows and how many
times the script has been started so far.
#!/bin/bash
if (! dir -d myDir); then
sudo mkdir myDir
else echo "The folder already exist!"
fi
cd myDir && sudo touch myFile2
I done 1. but on the 2. when i create the file i dont know how to chek for permissions and how to do it can someone help me please ?
I have to do a linux shell script. Write a script that does the following:
1. Check if there is a directory in / home with myDir name.
If not, it creates it.
2. In the directory it creates a new myFile file, checking if the user,
triggered the script, has write permissions on that file, if it does not, it outputs
Error message.
3. If there is, record the names, faculty numbers, and group of the file in the file
team members.
4. Shows the contents of the file on the screen by numbering the rows and how many
times the script has been started so far.
#!/bin/bash
if (! dir -d myDir); then
sudo mkdir myDir
else echo "The folder already exist!"
fi
cd myDir && sudo touch myFile2
I done 1. but on the 2. when i create the file i dont know how to chek for permissions and how to do it can someone help me please ?
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LEARN ABOUT DEBIAN
checkbashisms
CHECKBASHISMS(1) General Commands Manual CHECKBASHISMS(1) NAME
checkbashisms - check for bashisms in /bin/sh scripts SYNOPSIS
checkbashisms script ... checkbashisms --help|--version DESCRIPTION
checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence of bashisms. It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected. Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported by POSIX"; this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability. In cases where POSIX and Debian Policy disagree, checkbashisms by default allows extensions permitted by Policy but may also provide options for stricter checking. OPTIONS
--help, -h Show a summary of options. --newline, -n Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.) --posix, -p Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n). --force, -f Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears to be a shell wrapper). --extra, -x Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi- tive which may be ignored. For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set. --version, -v Show version and copyright information. EXIT VALUES
The exit value will be 0 if no possible bashisms or other problems were detected. Otherwise it will be the sum of the following error val- ues: 1 A possible bashism was detected. 2 A file was skipped for some reason, for example, because it was unreadable or not found. The warning message will give details. SEE ALSO
lintian(1). AUTHOR
checkbashisms was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by Julian Gilbey <jdg@debian.org>. DEBIAN
Debian Utilities CHECKBASHISMS(1)