[Solved] BASH - chaining TEST and COMMAND with && and II
Can you explain what this line of script is doing.
What I have understood is :
-- variable C is the name of a software which is either not installed, so it must be installed or allready installed and then should be update if newer version found
-- branch B="$B $C" is to install the software
-- branch D="$D $C" is to update the software
How does [ "$A" == "0" ] && B="$B $C" || D="$D $C" works ?
Code:
A="0" or not
B=""
C="a_software-5.4.3-7.x86_64.rpm"
D=""
#
Download_the_package_and_put_it_in_tmp_directory $C
#
if [ -f /tmp/$C ] ; then
[ "$A" == "0" ] && B="$B $C" || D="$D $C"
else
echo "Package not found"
fi
Hi there,
I found a trick to easily postpone a command by a few seconds:
supernova:~# sleep 10 && command &If you logout, the command should still be executed... But not all the time.
Could anyone of you explain me why the following command is executed even after logging out:
supernova:~# sleep... (2 Replies)
Hi friends,
I have a script that sets the env variable path based on different conditions.
Now the new path variable setting should not done in the same terminal or same shell.
Only a new terminal or new shell should have the new path env variable set.
I am able to do this only as follows:
>cd... (1 Reply)
Hi, I hope the title does not scare people to look into this thread but it describes roughly what I'm trying to do. I need a solution in PHP.
I'm a programming beginner, so it might be that the approach to solve this, might be easier to solve with an other approach of someone else, so if you... (0 Replies)
Hello All
I have a xml file with many sets of records
like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
also same file can be like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
<tag3>data2&data3</tag3>
Now i can grep & and replace with & for whole file but it will replace all... (4 Replies)
Hi, I have text file abc.txt. In this file, I have the following data.
Input:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith& Mrs Smith
Mr Smith &Mrs Smith
Output:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith&... (4 Replies)
What am I doing wrong here? Or is this not possible?
A bug?
alias f='find . >found 2>/dev/null &'
f ; sleep 20 ; ls -l
-bash: syntax error near unexpected token `;' (2 Replies)
Hi!
I wanted to simplify my bash prompt, so I edited my etc/bashrc file. I thought this was the file that would override any other env files. When I opened it, I saw that the way it was setup was not what my prompt looked like, although I forget exactly what was there. But i edited it the way I... (1 Reply)
This script runs tshark, then displays the output. I want to read a keypress at all times throughout this script, especially during the 10 seconds that tshark is running. This code however, only takes input before tshark runs.
#!/bin/bash
main() {
while (( "1" == "1" )) ; do
keypress &&... (3 Replies)
Hi All,
I am trying to run a script which will search for 2 strings(stopped,started) in a text file and echo an output depending on below condition
-bash-3.2$ cat trial1.txt
v
ggg
f
-bash-3.2$ cat trial1.sh
VAR9=` grep 'stopped' /tmp/trial1.txt`
VAR10=` grep 'started'... (4 Replies)
Hi All,
Do you have any sample script,
- auto get file from SFTP remote server and delete file in remove server after downloaded.
- only download specify filename
- auto upload file from local to SFTP remote server and delete local folder file after uploaded
- only upload specify filename
... (3 Replies)
Discussion started by: weesiong
3 Replies
LEARN ABOUT LINUX
dh_installdeb
DH_INSTALLDEB(1) Debhelper DH_INSTALLDEB(1)NAME
dh_installdeb - install files into the DEBIAN directory
SYNOPSIS
dh_installdeb [debhelperoptions]
DESCRIPTION
dh_installdeb is a debhelper program that is responsible for installing files into the DEBIAN directories in package build directories with
the correct permissions.
FILES
package.postinst
package.preinst
package.postrm
package.prerm
These maintainer scripts are installed into the DEBIAN directory.
Inside the scripts, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.
package.triggers
package.shlibs
These control files are installed into the DEBIAN directory.
package.conffiles
This control file will be installed into the DEBIAN directory.
In v3 compatibility mode and higher, all files in the etc/ directory in a package will automatically be flagged as conffiles by this
program, so there is no need to list them manually here.
package.maintscript
Lines in this file correspond to dpkg-maintscript-helper(1) commands and parameters. Any shell metacharacters will be escaped, so
arbitrary shell code cannot be inserted here. For example, a line such as "mv_conffile /etc/oldconffile /etc/newconffile" will insert
maintainer script snippets into all maintainer scripts sufficient to move that conffile.
A versioned Pre-Dependency on dpkg is needed to use dpkg-maintscript-helper(1). An appropriate Pre-Dependency is set in
${misc:Pre-Depends} ; you should make sure to put that token into an appropriate place in your debian/control file.
SEE ALSO debhelper(7)
This program is a part of debhelper.
AUTHOR
Joey Hess <joeyh@debian.org>
8.9.0ubuntu2.1 2012-06-12 DH_INSTALLDEB(1)