A script is a sequence of commands or instructions that are executed by an interpreter program rather than compiled into a standalone executable program.

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Debian (jessie) with XFCE, Sessions and Startup: Application Autostart

Long-time lurker, first time question-asker. I am running Debian jessie with XFCE, kernel 3.16.7. In the course of setting up Conky to run at startup, I wrote a bash script to... well.. run Conky. ...
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Few questions about realization of commands using bash scripts

I'm the newbie into scripting, so, please, sorry for annoying questions. I need to create bash script file, which after its launch does following. 1) Suppose after launching the script I enter the ...
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3answers
66 views

Is there any way of speeding up this DNS script I made? [on hold]

Part of my work is doing a lot of different DNS lookups, so I created a script that displays the information that I need in a neat fashion. Problem is it's not very fast. Doing a bash -x I can see ...
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4k views

Split PDF into documents with several pages each

There are several resources on the web explaining how one can split a PDF into many files with on page per file. But how can you split them into chunks of, say, five pages each? I have looked into ...
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2k views

How to execute Netscaler commands through a remote machine via SSH connection

I have been trying to execute some NetScaler commands like "bind" & "unbind" through a Linux Box via an SSH Connection. Now the Problem is, Manually we are able to enter & execute commands on ...
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15 views

Systemd and controlling network settings

I'm trying to figure out best way to control network settings in best way possible in real time. My current plan is this: Start ip -s -d -o monitor with systemd and write its output to file ...
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1answer
2k views

autologin console as root on fedora

Can someone help to autologin in console text mode as root in fedora, usually I can do using script like this : /sbin/autologin.sh: #!/bin/bash 0</dev/$1 1>/dev/$1 2>&1 cat /etc/issue ...
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35 views

script to delete files when it cross limit size

I want to make a script which delete files when it cross 70% usage. In directory there are logs files has 9.6 MB size. I want that if directory cross 70% then it find oldest files and delete them. ...
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41 views

How can I add a filter to my grep script to NOT include a string?

I'm working on a script that will separate the Registrar information from a domains whois. So far it's working enough but there are a few things that I want to remove in order for it to be a bit ...
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3answers
53 views

Efficiently compare If variable exists and is not equal

I have a problem with the sh script syntax. I wrote a script for my Asus router. The script works perfectly. But I have this line: if [[ "$OldIP" && "$StartIP" != "$OldIP" ]]; then echo OK; ...
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54k views

su options - running command as another user

I was wondering how to run a command as another user from a script. I have the script's owner set as root. I also have the following command being run within the script to run the command as the ...
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40 views

How to execute a command when internet is back

Sometimes my wifi is connected to router but my router is not connected to internet. How can I execute a command when my internet is back (from command line)? I want to execute: mpg123 ...
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94 views

How can I compare different files without opening them?

I have two directories A and B; each one contains a lot of sub-directories geom001, geom002 ....etc each sub-directory contains a file named results. I want to compare, without opening any of ...
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53 views

Rename files based on JSON content

I have two sets of files; file1.txt file1.json file2.txt file2.json file3.txt file3.json ... fileN.txt fileN.json json files contain the following format: {"ago": "59 sec ago", ...
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2answers
47 views

cut -c won't work on my .sh file [closed]

I have tried the following commands cut -c-11 ifshell.sh cat ifshell.sh | cut -c-11 ifshell.sh cat ifshell.sh | awk '{print $1} | cut -c-11 ifshell.sh But every time I get the full contents of ...
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3k views

How to execute grep in tcl for getting XYZ-123 type pattern

How can I execute this grep command in TCL? grep '[A-Z][A-Z][A-Z]\-[0-9][0-9][0-9]' file1 > file2
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92 views

Find string in text file and execute a script depending of the result

I have a file (Data.txt) with something like this: A=1234597890 B=192.168.1.1 sometimes B goes first and sometimes only A or B. So, If I find: A, Print A content and execute A script B, ...
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71 views

Script fails, but copy and paste from script works

I made a script to check the computer's processor count and then change all references of the processor number in another script in accordance with that.  I tested it first by copying and pasting it ...
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32 views

find matching URLs in a line, then shorten them to the domain name

I am new to the Linux command line and need some help. I have a log file I am writing a script for so it only shows certain fields of output. The last bit I need is to shorten the URL's so that it ...
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2answers
553 views

How do you keep the password hidden when invoked during the su command?

This is the first time it has happened to me where I am using the su command and it actually displays the password on the terminal and doesn't stay hidden. Here is my code snippet: sshpass -p ...
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2answers
25 views

Improving execution speed of Screen Brightness Script

xrandr --output LVDS-1 --brightness $(bc -l <<<"$(sed 's/Brightness: //' <<<$(xrandr --prop --verbose | grep Brightness)) $(if [ "$1" = "+" ];then echo +;else echo -;fi) 0.1") I ...
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43 views

How can I subtract two variables in bash?

Hi Guys am getting error please help to sort out. I am new to scripting Script: #!/bin/bash value='55' size=`df -kh | grep '/vol/cdr/MCA' | awk '{print $5}'| sed 's/%//g'` if [ "$size" -gt "$value" ...
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23 views

What is the difference between '[' and '[['? [duplicate]

(Hope this is no duplicate) So I have a part of script like this: $ a='f' $ [ $a = [fF] ] && echo yes || echo no no $ [[ $a = [fF] ]] && echo yes || echo no yes So, why do the ...
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1answer
38 views

How to follow the activity of one specific file [closed]

I have currently MAAS deployed on one of the servers. It all works (most of the time). Now I have added some lines in the WOL file for MAAS (/etc/maas/templates/power/ether_wake.template). I wanted to ...
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36 views

Collate image list with name

How to create a collation of images in the format: image_name_1 [IMAGE#1] image_name_2 [IMAGE#2] image_name_3 [IMAGE#3] ... Using Imagemagick I can say something like: montage -label '%f' -mode ...
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31 views

How can I edit my bash script to account for whitespace entries? [duplicate]

I made a script to automate ffmpeg conversion from mkv > m4v > open the m4v in Subler.app to import the metadata manually, at which point I'll move the file into my iTunes library. I use iTunes ...
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1k views

How do you make case statements with ranges

I'm supposed to: Make a case statement that will display the a grade after input. With no loop or conditional. A=90-100, B=80-89, C=70-79, D=60-69, F=0-59 This is what I have so far: ...
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20k views

Execute shell script from php, as root user?

Need to execute the following line from PHP: $res = shell_exec('sudo sh /home/nicklas/cronjobs/make_account.sh username password'); The problem is nothing happens on execution. If i try to ...
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2answers
32 views

pausing a loop in AIX to wait for user input

I'm searching for a scripting mechanism that can realize the following idea. Loop over a list and stop/wait on "read x" until the next input from a user. I know the following script is not working! As ...
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947 views

Permission denied when run script via ssh

I wrote script which download via scp and install some packages. SSH keys are added to host and when I run [root@HostB ~]# ./myscript everything is ok and packages are downloaded via scp without ...
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Silhouette from an image

How can I create silhouette from an image in linux using the terminal? By creating silhouette I mean - how do I turn the RGB components values of an RGBA image to #000000, while preserving the alpha ...
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53 views

Shell script to delete logs when the disk space reaches 90%

I need help to develop a shell script to delete the logs automatically once the disk space reaches 90%. I can add this shell script to crontab jobs.
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35 views

How to add the aggregated numbers in a file

I need to write a script which will add the values for the same string in different lines. For example when a file contains the following: abc,10 xyz,20, abc,30, ghd,40 xyz,10 script should check ...
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Check if a remote machine is in a cluster

How can I verify if a remote machine is a cluster machine? I just created the following ssh command to verify if the remote machine is a VRTS cluster or a Linux availability Red Hat cluster ...
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993 views

Can capabilities be used in scripts without setcap'ing the interpreter binary?

Right now I'm using cap_net_bind_service MY_USERNAME in /etc/security/capability.conf. Now I just need to set cap_net_bind_service+i on the interpreter of my favouite scripting language to be able to ...
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VBA loop through folders [migrated]

I´m trying to loop through folders on my brothers computer and what Im trying to do is to loop through the folders and the open the excel files contained in each sub folder and after copy that ...
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Script or command to list all top-level directories that contain sub-directories with modified files less than 30 days old

This is quite a unique one. I'm looking for a way to list all top-level directories in a folder that contain sub-directories with new or modified files less than 30 days old in them. We use a ...
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674 views

Execution time of pi calculation in shell scripts

I have to run a couple of command lines on a shell script on Ubuntu, one of those is a pi calculation. It works fine when i run it on terminal via the following cmd line: time echo ...
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How can I print only certain commands from a bash script as they are run?

I have a bash script with various if statements based on command line arguments I pass in when calling it. Having some kind of output as to what commands are being run is helpful to confirm the flow ...
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36 views

Script input filename or standard input

#!/bin/sh read vstup if [ -f "$vstup" ] then cat $vstup else if [ $vstup = "-"] then while [ $stadvstup != "q"] do read $stadvstup >> temp.txt ...
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36 views

Best way to delete select email messages from mbox file using script

I have an arbitrary email messages file in mbox format. I would like to periodically (end of the week), and automatically (via cron) purge messages from my "alerts" mbox file (new folder) just from ...
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1answer
43 views

Bash script fail to detect disk

I got a script that is supposed to reformat and mount /dev/disk/by-label/backup_disk into /mnt/backup_disk. Like this: /sbin/mkfs.ext4 -q -L backup_disk /dev/disk/by-label/backup_disk mount -t ext4 ...
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25 views

Script - numberlines

I would like to make a script, which allows user to input some text and it will output the same text with number of lines. Example: Input: Hi Jack, how are you? Output: 0001: Hi Jack, 0002: how ...
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70 views

Safe way to install .sh script in /usr/local/bin?

I want to include correctly the following script in Ubuntu 16.04. Code #!/bin/sh # http://tex.stackexchange.com/a/20886/13173 # $Id: pdf2eps,v 0.01 2005/10/28 00:55:46 Herbert Voss Exp $ # Convert ...
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39 views

Script too slow ? Any particular reason?

I have a script which does hexdump along with pipeline commands and finally I am redirecting it to a file. Now I am logging data from the serial port of my Raspberry Pi. I also call a python ...
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519 views

Unix Shell script to delete all traces of itself after execution through crontab

My Question has 2 parts. Help with both parts is greatly appreciated. GIVEN INFO: - Lets assume there are 2 Folders, Folder A and Folder B. - Folder A contains many files. - Folder B contains the ...
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Access to bash arrays in gnuplot [duplicate]

In a bash script I have several arrays which I need to access in a gnuplot code: #!/bin/bash ... # fill array a[*] and b[*] ... gnuplot <<EOF do for [j=0:10] { # access ${a[j]} and ${b[j]} } ...
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Need help in a shell script

I need help with the below shell script. I have three environments: test, dev and prod. When the user enters test it should ftp to test host and ftp the file. Same in case of dev and prod. I have just ...
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12 views

Linux Mint Corners Musical Sequence Associative Array

I am writing a script which uses hot corners to play specific musical notes when hovering in corners, and depending on the musical sequence to execute a specific command. The script is called with ...
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2answers
65 views

Using regular expression to extract content of file [closed]

I have a link and I would like to return only content between www. and .com e.g www.blablabla.com would return only blablabla How could I do that? When I use grep '\.[a-zA-Z0-9\.-]*\.' it gives me ...