A shell script is a script written for the shell, or command line interpreter, of an operating system.

learn more… | top users | synonyms (1)

1
vote
2answers
12 views

Given key-value content, how do I group values by key and sort by value?

I've the following sample input format (file or stdin): key1: 1 key2: 2 key3: 3 key1: 4 key2: 5 key3: 6 Is there any few-liner which can group values based on the key and then sort? Expected ...
0
votes
1answer
13 views

How can I append text in the middle of a pipeline?

With cat its possible to append a file to the data passing through a pipeline: foo | cat - somefile.txt | bar Is there a command that lets me append text without using an intermediate file? foo | ...
2
votes
1answer
37 views

UNIX, how to compare and transfer values between two text file

I have two text files with different number of columns in them and I want to compare values of a given column in file1.txt with values of a given column in file2.txt: if these values found in ...
0
votes
2answers
25 views

How can I create a shell script shortcut?

I'm using Debian and there's a user who has a script called start.sh. I want the user to be able to call the script by typing application ... instead of ./start.sh ... I've been playing with symbolic ...
1
vote
1answer
46 views

How can I elevate my cmd prompt using the the cmd line

I follow this script "runas /profile /user:administrator\administrator cmd"and when it prompts me for my password it always says that it is incorrect even though i am spelling it correctly. help ...
0
votes
0answers
12 views

Zipping folders and using the folder name in the archive [duplicate]

I have a bunch of folders in a directory. I'd like each one zipped in it's own archive and the source folder should be deleted. So if my source folder has: Folder1/ Folder2/ Folder3/ After the ...
0
votes
1answer
17 views

Remove a specific string common in multiple lines in a CSV file using shell script

I have a CSV file which contains 65000 lines (size approximately 28 MB). On each of the lines they have a path in the beginning in the format of: c:\abc\bcd\def\123\456. Now let's say the path ...
11
votes
4answers
1k views

Who deals with the star * in echo *

Who deals (interprets) the * in echo * Does the echo see the star or the shell take care about it and return a list of filename .. What about cp temp temp*
0
votes
1answer
10 views

Use of variables withing singlequotes, CSH

I have a short script meant to do some server maintinence, but I can't for the life of my figure out how to properly use variables within my script, Here's a code sample to make it more clear: ...
0
votes
0answers
7 views

Copy from SFTP to local host using Username/ privatekey.ppk using powershell

would you please help me , i need script that copy files from FTP server to local host using only Username and .ppk as a private key , i don't have password. is it possible to do that. Please ...
0
votes
0answers
20 views

OS X Automator to create a set of folders based on list in a text file

I'm a Terminal and Automator novice. I have found a terminal command that allows me to create a bunch of folders from a text file formatted as following: "Folder Name" "folder Name Two" "Another ...
0
votes
0answers
8 views

Execute commnad after server started in other pane with tmuxifier or tmux

I have a window with several panes where I execute commands to start the servers. I want to be able to execute commands after a server is running. To run commands in the same pane is not possible ...
2
votes
0answers
25 views

How do I record in VLC media player on a schedule?

I have an IP stream coming through VLC media player in Window 7, and I would like to automate the process of opening the stream and start recording at a specified time, and stop VLC and the recording ...
0
votes
0answers
17 views

shell script to generate a log file for VM Backups

we are using PHD virtual backup to trigger backups for VMs and now i want to generate a report of all VMs in a file consisting of VM Name, Date and Backup Time and mail it to my ID at particular ...
-1
votes
1answer
39 views

How to switch to another user from SSH?

I am looking for a command to SSH to a server using root and then switch it to other user after executing SSH. Could someone please help me in providing the command for this. Not Working: ssh ...
0
votes
3answers
79 views

Print previous 20 lines of text from a certain point of a text file

Currently: I'm new to scripting, teaching myself as i go along and this is my first script I'm developing. What my script is trying to do is look at specified file, scan the file to find the word ...
2
votes
1answer
77 views

How can I check if a file is newer that the target file in a shell script

How can I check if a file is newer that the target file? In a shell script, intended to run on a Mac, I want to do something like this: #!/bin/bash if [ $SourceFile dateisgreater $TargetFile ] then ...
0
votes
0answers
12 views

Setting a CRON to be run on every 1st and the 3rd Monday

I need to set up a CRON job to be scheduled in every 1st and the 3rd Monday of every Month. I'm using the Plesk control panel for setting these as follows. Currently CRON runs successfully, ...
1
vote
1answer
64 views

Calling parallel ssh (pssh) in bash script

I can run commands in parallel on a list of machines using psshcommand. For instance to make a folder foo on several machines, listed in hosts.txt I can run: pssh -h hosts.txt -l MyUserName "mkdir ...
1
vote
2answers
36 views

Spaced string variable as command parameter inside shell script

How can I store a spaced string in a variable and use it as a command parameter inside a shell script? This is what I'm trying to do: DESTINATION='/mnt/External Harddisk' ...
-3
votes
2answers
36 views

Create windows script to traverse all subfolders of some folder, and delete a certain folder and all of it's contents if it exists [closed]

here's the trick. Supposing I want to free up some space, and run that script in F:\UnrealProjects, which has a bit over 50-60 subfolders, I would like that script to traverse all of it's subfolders, ...
0
votes
0answers
12 views

script not running from remote machine

I have a shell script file in one machine(say jupiter.prashanta.com) which basically runs vlc as user. When I run this file ./runVLC.sh , it runs fine. The content of runVLC.sh is #!/bin/sh su user ...
1
vote
1answer
56 views

how to run a user command from a script

I have to run a vlc command, which cant be run as root. I am logged in as root. I want to put the command in a script ( shell script ) and run the command. How can I do this.My script is ...
-1
votes
2answers
85 views

Value of variable set in 'while read' loop looses value outside the loop

The following code is a simplified version of the real life task. Of course I know that I could achieve what is done in this simplified example with a if [ ... ]. This is only to demonstrate the ...
0
votes
2answers
252 views

How to run a script after startup on Ubuntu 14.04?

I have scoured the web and tried numerous solutions. Nothing has worked for me so far, hence this question. I have a rails application that I run with mongrel_rails start -e production -p 80. That ...
1
vote
0answers
16 views

Grep from Log & Calculate then alert

I have a log file, which has the below lines in it. I need a bash script, which takes the values in Bold (4092.1M / 20.1G) & do the math & then alert from Zabbix [Eden: ...
0
votes
1answer
59 views

What do these parameters do?

What is the meaning of the switches and parameters of this command? exec su -s /bin/sh -c 'exec "$0" "$@"' root -- /opt/nsq/bin/nsqd Specifically the -- part and what exec "$0" "$@" is supposed to ...
3
votes
2answers
85 views

Loop in a script until file exists

I'm trying to have a script find a file in /tmp called sleep.txt but instead it keeps looping Here's what I have: #!/bin/sh set -x until [ $(ls -la | grep -w "sleep.txt" | wc -l) != 0 ]; do ...
0
votes
1answer
65 views

Unix Script: Wait until a file exists

I need a script that will wait for a (examplefile.txt) to appear in the /tmp directory and once it's found to stop the program, otherwise to sleep the file until it's located So far I have: if [ ! ...
10
votes
3answers
517 views

Programatically determine if an script is being executed on laptop or desktop?

Is there any reliable way to determine (programmatically) from within a bash script if it is being executed on a laptop or a desktop computer? I could obviously just prompt the user to ask them, but ...
1
vote
1answer
27 views

protect the known_host file from writing - good or bad idea?

I want to protect the known_host file from writing So I want to perform the following steps on my Linux red-hat server Cp /dev/null /root/.ssh/known_hosts chattr +i /root/.ssh/known_hosts I want ...
0
votes
1answer
91 views

How do I save a string of numbers from an ongoing command to a list in a shell script?

I am trying to make a shell script for recording macros via recording the individual keycodes of each button press. The command for it looks like this: xev | grep -A2 --line-buffered '^Key*' | sed ...
1
vote
1answer
82 views

Exit bash script when curl gets a non 200 HTTP status

I have a bash script setup to perform a few curl requests for currency in EUR INR JPY do curl -i --data '{"currency": "'$currency'"}' -H "Accept: application/json" -H "Content-Type: ...
1
vote
1answer
90 views

file exists not working in expect script

I'm trying to check if a particular line exists in filename on a host. So only if the particular pattern is found from the grep command a dummy.txt will be created. Then I want to check if dummy.txt ...
1
vote
2answers
25 views

Not creating new file while output redirection

I'm using this for output redirection: cat filename | grep 'dis' | wc -l > test.txt But I do not want a zero byte file created if no result is found from the grep command. Is there any way this ...
0
votes
1answer
150 views

cannot open `' for reading: No such file or directory

I am trying to run .sh file on RH6 and getting this error... cannot open '' for reading: No such file or directory The script I am running is internally referencing other scripts, located in same ...
0
votes
1answer
31 views

Executing Perl command from shell script not resulting into anything

I am trying to execute the below command from a shell script: perl -pi -e 's/Ç/|/g' diff_new_old.dat This command gets executed without any errors, but the execution doesn't do the intended ...
1
vote
1answer
50 views

How to make wget create appropriate zero-byte files?

I'm trying to use wget to download entire directories with their contents from a webserver. Some of the files there have zero length. Is there a way to make wget create the 0-byte file on the client? ...
0
votes
1answer
90 views

Curl globbing (asterisk expansion) on windows

On windows, in git bash (but in system console too, I think) Why curl ignores all my attempts to disable globbing and expands asterisk? $ GLOBIGNORE="*"; set -f; curl --noproxy "*" ...
3
votes
1answer
38 views

How do I prepend a string to program output without waiting for the whole line?

I have a script that runs a command on a remote server using SSH. I want to prepend the string Remote: to every line of the output, but I don't want each line to be delayed until the whole line is ...
0
votes
0answers
16 views

Sort not respecting the key field specification?

I'm trying to sort the output of a command by a single column, but I'm having some problems with the behaviour of sort. It works fine in this scenario: $ echo 1\\n10 0 | sort -s -k1,1 1 10 0 But ...
0
votes
1answer
168 views

Make Applescript wait for an application to be closed before running a shell script

I have an applet i made using Applescript which opens an Application and then once it's loaded runs a shell script which unload's Spotlight. I need to make it then wait for me to finish using relevant ...
-1
votes
1answer
46 views

I am trying to embed a patch in a bash script - can't get patch to read the patch from a variable

read -d '' PATCH_OS <<EOF //PATCH//TEXT// EOF patch -b < ${PATCH_OS} This fails: ./script.sh: line 39: --- //PATCH//TEXT// (line 39 is "patch -b < ${PATCH_OS}"")
0
votes
0answers
23 views

How to query if a wlan interface is in monitor mode?

I am trying to write a shell script to query whether a wireless interface is in monitor mode or not. I was thinking about querying a file in the linux(debian) by doing a cat /proc/.. file system to ...
0
votes
1answer
32 views

Bash script failure

I have this script. It works fine on one of system but it's giving some error on another machine: 1 #!/bin/bash 2 EXEC_DIR=`dirname ${0}` 3 source ${EXEC_DIR}/config.sh 4 5 ...
1
vote
2answers
32 views

Need help trying to get a script to start on boot

Luke here! Although I've been using Linux as my main OS for quite a while, I'm still pretty much a noob when it comes to using it. Sorry. I have a Raspberry Pi that I'm trying to set up with the ...
6
votes
3answers
801 views

Where are shell functions stored on Linux?

At first I was looking for the reason that which doesn't output anything after giving it certain programs as an argument, e.g. cd. From what I've found here, the reason probably is that cd on my ...
2
votes
1answer
972 views

How to update bash on Mac OS X Yosemite

Just trying to learn bash scripting a little. My old bash version: Bash version 3.2.53(1)-release... I've updated my bash on mac os x yosemite with homebrew: brew update brew install bash Then ...
0
votes
0answers
19 views

Staret managed server using Jenkins

I am trying to start web-logic managed server from Linux system. for that I have one shell script start_wls_managed4_btwnpmd01.sh with following code. ...
0
votes
0answers
41 views

xdotool ignores “ctrl” used with acroread on Linux

I'm using Acrobat Reader (v9 for Linux) as an external viewer from an editor for a generated PDF file. Since the file is often regenerated, I programmed a function key in the editor to call a shell ...