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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Using variable in KSH function

I tried to have a switch if either an option is set or not while getopts "s:u:d:e:ch" _OPTION; do case $_OPTION in ... c) isCSet="Y" then I'm ...
1
vote
1answer
221 views

Automount post-unmount script

My intention is to spin-down an external USB drive after 20 minutes of not being used. In the normal case I would use hdparm for this but unfortunately this doesn't work on my external USB drive. It ...
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1answer
795 views

Using alias in another script (ksh)

I'm writing a ksh script, and I'd like to use a command define by an alias in my .profile file, in my script. I tried this command in the folder containing my script, and it works. However, in my ...
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3answers
83 views

Ksh script warnings [closed]

While running my script, I got the following message (it's not an error strictly speaking, because the execution go ahead after) : myScript -s test -u test2 pk_copylogs[2]: hist: :: not found ...
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4answers
1k views

How to use wc and piping to find how many files and directories are in a certain directory?

How can I use word counter and piping to count how many files or directories are in /usr/bin directory?
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2answers
353 views

vim: Execute BundleInstall without showing the vim interface

I have a installation script that I use to initalize my vim plugins when I'm on a new machine #!/bin/bash # Clone vundle into the directory if it's not already if [[ ! -e bundle/vundle/.git ]] then ...
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5answers
211 views

Is there a difference between ./script and bash script?

Given a shell script file that begins as #!/bin/bash # (bash script here), and has been chmod +xed, is there any difference in running ./script and bash script from the command-line?
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2answers
254 views

Is it possible to control xterm (or specifically a process that xterm has started) from another process?

If I start a process with xterm like this (where omxplayer is the process xterm is starting): xterm -fullscreen -fg black -bg black -e omxplayer -o hdmi -r %f Is it possible for me to write to ...
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3answers
87 views

Fast access to often used document

For several applications I maintain my personal cheatsheets. I use them mostly for vim, latex, vim latex-suite and bash. For example, when I forget a key combination in vim, I browse to the ...
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1answer
568 views

How do I track down the source of a ssh login message?

I installed mailutils on my linux machine with Linux Mint 15 (basically Ubuntu 13.04). When I log in, I get the following: Welcome to Linux Mint 15 Olivia (GNU/Linux 3.8.0-32-generic i686) Welcome ...
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votes
3answers
92 views

What is the language that appears on the first line of a script? [duplicate]

Bash scripts start with the following line #!/bin/bash # Rest of script below ... In bash the # character is the start of a comment, but #!/bin/bash is definitely not a comment, therefore it isn't ...
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1answer
211 views

Why does a working standalone nested function/script not work inside a larger script? [duplicate]

The following (nested) function/s function hpf_matrix { # Positional Parameters Matrix_Dimension="${1}" Center_Cell_Value="${2}" # Define the cell value(s) function hpf_cell_value { ...
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4answers
153 views

Clean way to temporarily replace a config file?

I use a drawing program called Inkscape, which has both a GUI and a command line interface. When used on the command line, it has a large number of options that can only be controlled through a ...
1
vote
2answers
57 views

copy a section of data from stdin [closed]

I am running a script that takes its input from stdin. This input can end up being very large so I want to extract the part I'm interested in to a temp file. The first line contains "[cics]" and I ...
2
votes
2answers
518 views

How do I trigger a script when a folder is updated in Solaris 5.10?

We are trying to write a script to move away files as soon as they drop in a folder. One way of achieving this is running rsync in a script on cron scheduler. The problem with this approach is the ...
2
votes
1answer
202 views

shell script to append ID for newusers command

I am in the process of creating 60 users locally in a linux machine. I wanted to do it automatically and so I found I can use the newusers command to add the users in batch. I have the users and ...
3
votes
2answers
40 views

Overriding amended time stamps

I need to make it so the files in current directory get amended with a timestamp. It works fine for the first time, but once I run it again it adds another timestamp to the file. I need a way to ...
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2answers
441 views

Need to copy files to existing directory and remove files already there with the same name but different extension

EDIT: Total rewrite of question for clarity. I have a directory tree (new) with a bunch of files of with an extension of .new. I have an identical tree (old) where many of the files have names ...
2
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2answers
4k views

integer expression expected bash

Trying to loop a phrase inputted by the user a set amount of times that is also inputted by the user. Keep on getting the error integer expression expected, and I can't figure out how to fix it. ...
1
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1answer
58 views

Grep expression with special file names

I have to go through some regular files in directories and find those files, that have their own name in its content. In the following piece of script is a cycle in which I am going through paths ...
3
votes
1answer
182 views

Script to find the default Desktop Environment?

Assume a Linux Desktop Environment system is installed. When powered on and credentials entered, whatever Desktop Environment is started i would consider the default Desktop Environment. The user may ...
3
votes
1answer
1k views

Why is expect's interact command not working?

I am trying to automate gdb with expect. My script will start gdb, do some initialisation, and then pass the control to the user. Expect's interact command seems like the perfect tool for the job. ...
3
votes
1answer
3k views

Extract single file from tar to other folder

I've searched for multiple forums for this questions and have seen different answers but so far, nothing have worked yet even from the ones I've seen here. I want to extract a single file from a tar ...
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3answers
623 views

rsync most recent x GB

I'm looking for a command/script to allow the most recently modified files (up to) 10GB be copied to another computer. So if there are 4 files 4 GB each, only 2 of them should be transferred by the ...
2
votes
1answer
259 views

tar and if-statement

I have a script that check if a file exist inside a tar file but something's wrong because it always go to the else part of the script. I am pretty sure that it shouldn't be that way. The date is in ...
-1
votes
1answer
47 views

A triangle of forward differences in gawk

I need a gawk script (not a one-liner, I need a function). Given a row of integers i.e. 0 2 4 1 9 5 1 1 the function should generate successive forward absolute differences, so: 0 2 4 1 9 5 1 1 2 ...
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0answers
26 views

Variable Substitution in sed [duplicate]

I have this script and I need to count the lines inside a file, then pass the number of lines counted to a for loop so that I can get the contents of each line and put it in a variable. My question ...
2
votes
3answers
528 views

How to put fixed-width, vertically-oriented key-value pairs in a CSV file?

I have a text file with the following type of content: OPERATION_CONTEXT VMD1HTE1A71_ns:.oc.GJ_OAD2 alarm_object 1130 On director: VMD1HTE1A71_ns:.temip.VMD1HTE1A71_director AT Fri 18 Oct 2013 ...
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votes
2answers
301 views

Formatting quotes from the fortune to use it with conky

I'm using fortune cookie outputs in my conky script. My fortune output is in the following format: Text1 : Some message including( line break tags, e.g. and comma(,),=,semicolon(;) like ...
1
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1answer
371 views

How to see interactive output when running nmap from a bash script?

I'm trying to run nmap from a Bash script, in a way so that when Enter is pressed it should give some output, as happens when running directly from the commandline. When calling a few different nmap ...
1
vote
2answers
785 views

Get exit code of command executed by the linux script command

Note this is run on a debian linux environment I have the following sample script called HelloWorld.sh #!/bin/bash echo "Hello World" exit 1 I then run the following command script -c ...
3
votes
0answers
53 views

Notifying program that X session is shutting down

Ok. I understand X session is a bit vague here so let me clarify what I mean by the phrase. I mean the situation where a person has been presented with a display manger screen ( eg xdm, kdm, gdm, mdm, ...
2
votes
1answer
60 views

How do I drop to a shell after exiting a command I started by scripting tmux?

I'm following this tutorial for scripting the creation of tmux windows. tmux new-window t $SESSION:0 -k -n MAIN 'cd ~/main/ && perl -Ilib myapp' sometimes I kill myapp after I've started ...
3
votes
5answers
469 views

Delete all files in directories except those whose path are listed in a file

Given the following files: data/A/a.txt data/B/b.pdf ... date/P/whatever.log ... data/Z/z.jpg I would like to delete all files in the data/A/, data/B/, ..., data/Z/ directories except those files ...
10
votes
3answers
2k views

Advice for managing SSH keys

What is the best practice you have found for managing lots of SSH keypairs? I use SSH to connect to several systems, both at home and at work. I currently have a fairly small, manageable collection ...
3
votes
2answers
154 views

Running commands after event based outputs

there are commands like iwevent or tcpdump -n src host x.x.x.x that send to the stdout some lines when something happens. Is there any form of running some command inmmediatly after a ...
1
vote
1answer
275 views

Checking mail and running a script without downloading

I'm writing a script to run certain processing activities (mainly moving some data files to another machine where they can backed up), but I only know when to trigger the copy when a mail is delivered ...
0
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2answers
84 views

Run level script - Help

I want the following command to be ran, as soon as system boots. glances -s -P redhat & How to achieve that? I tried writing a run level script which didn't work as expected.
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1answer
459 views

Script ends abruptly with a Terminated message

This is my bash script. All it does is to check whether a service has started and whether some processes are running as expected. It ends abruptly with a Terminated message. I tried debugging it ...
4
votes
1answer
85 views

How can I get information about my virtual desktops via the command line?

I'm curious how I can get information such as the dimensions of my desktop, which desktop is currently active, and what labels (if any) are set for my desktop enviornment (DE).
2
votes
3answers
190 views

Concatenate files in multiple matching subdirectories

I need to concatenate files based upon the name of the subdirectory they are in. The subdirectories sometimes have duplicates and sometimes don't. The file structure looks like this: RootDir 633 ...
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votes
2answers
86 views

Make a new sniffer [closed]

How can use the Linux-kernel to supervise what is going on, about the new connections, new ports, connected hosts? Like I will do a new sniffer. Which files should I monitor to know what is going ...
4
votes
1answer
710 views

How to set firefox homepage from terminal?

I am trying to configure firefox from a script. I have already hit a wall establishing the deafault homepage. Found some old info what does not work anymore: echo ...
10
votes
2answers
5k views

Regular expression in bash script

This is my first time bash scripting so I'm probably making an easy mistake. Basically, I'm trying to write a script that gets the groups of a user, and if they are in a certain group, it will log ...
2
votes
2answers
291 views

Optimized way to list and delete files

I need to list and delete .php, .xml files. For this I am using find command. To list : find . -type f -name \*.php -print0 To delete : find . -type f -name \*.php -print0 | xargs -0 rm -r As I run ...
6
votes
2answers
914 views

How does this find command using “find … -exec sh -c '…' sh {} +” work?

@StephaneChazelas posted the following solution to this Q&A: Having some trouble using “find -exec {} +”. $ find . -iname "*.extension" -exec sh -c ' exec <command> "$@" <additional ...
2
votes
2answers
175 views

Sanitize Apache access log files?

We have this code in a shell script that pipes output for Apache to log. declare -a values=( $taintRequestVals ) for item in ${!values[@]} do cat $apacheLog | sed ...
5
votes
2answers
23k views

how can I add (subtract, etc.) two numbers with bash?

I can read the numbers and operation in with: echo "First number please" read num1 echo "Second mumber please" read num2 echo "Operation?" read op but then all my attempts to add the numbers fail: ...
3
votes
2answers
699 views

How to copy multiple files but keep their extensions the same?

I am looping through a number of files, and $file represents the current file. How can I make copies or renames and keep the extension the same for this current file? e.g. if $file = x.jpg How to ...
1
vote
3answers
1k views

How to add Multiple Searches in AWK command

Im trying to search for the files Created in June,July and August months. I used this method ls -lrth|awk '/[Jun][Jul][Aug]/ {print}' but it ain't working. Please help me correct the syntax.