Questions about shell scripts, executable files that are interpreted by a shell (bash, zsh, etc.).

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3
votes
1answer
164 views

batch tool for sending files over webdav

I know there is cadaver for working with webdav. But it opens an interactive console. I want to write a script that will send files over webdav protocol in a batch mode. What tool can I use?
4
votes
2answers
192 views

Shell script error handling while assigning STDOUT to variable

I am trying to implement error handling in my shell script as described in the 2nd answer in Best practice to use $? in bash? My script looks like this: #!/bin/bash try() { "$@" code=$? ...
1
vote
0answers
112 views

Verbose output in logfile and simple output on screen?

Let's say I have the following script: script.sh and i want the verbose output in a logfile and simple output on screen. Logfile should contain the csh -v script.sh output, and on the screen should ...
2
votes
1answer
83 views

How can I pipe the output of a program or function into a variable?

How can I pipe the output of a program or function into a variable? For example lets say I have this script: function foobarize () { sed \ -e "s|${foo}|${bar}|g" \ $1 } echo foo | ...
5
votes
3answers
686 views

How do I capture stdin to a variable without stripping any trailing newlines?

In a shell script... How do I capture stdin to a variable without stripping any trailing newlines? Right now I have tried: var=`cat` var=`tee` var=$(tee) In all cases $var will not have the ...
3
votes
2answers
275 views

Go up one level from a nonexistent path

I have some code like this in a script (bash) file: if [ ! -d $dir ]; then cd $dir/.. git clone http://... fi Of course as written this doesn't work since $dir does not exist. Is there a ...
5
votes
3answers
11k views

How to call a service URL from bash shell script in parallel?

I have a service which I am calling from another application. Below is my service URL which I am calling - http://www.betaservice.domain.host.com/web/hasChanged?ver=0 I need to do some load test ...
2
votes
1answer
194 views

scp (v4) copy from remote to multiple local filenames

I did a bunch of googling and I think what I am trying to do is not possible with openssh/scp v4.x but wanted to ask here in case someone has a creative workaround. I want to copy multiple files from ...
3
votes
1answer
445 views

Installing noip via sh script

I have this script: cd /usr/local/src/ wget http://www.no-ip.com/client/linux/noip-duc-linux.tar.gz tar xf noip-duc-linux.tar.gz cd noip-2.1.9-1/ make install <<END_SCRIPT Username password ...
3
votes
4answers
9k views

“Can't cd to /home/user” when sourcing a script

I have this script: echo $HOME cd $HOME cd / cd /usr/local/src/ When I run it like this . script.sh I get this output: /home/user : No such file or directory : No such file or directory : No ...
2
votes
4answers
400 views

How to have service that makes sure program keeps running?

I made a service called thin_keep_alive_service in /etc/init.d. I gave it chmod +x rights. The script looks as follows: #!/bin/bash ### BEGIN INIT INFO # Provides: thin_keep_alive_service # ...
3
votes
2answers
201 views

get result text from CLI command

I'm writing a bash script and I need to capture the text resulting from the output of the rsync command, for instance, the following command: rsync -av "$FOLDER1" "$FOLDER2" prints: ... sent ...
13
votes
2answers
660 views

When running a shell script, is it possible to pass specific positional parameters without having to enter them all in order?

For example, if I have script ./foo that takes 10 parameters, and I only want to pass the 8th parameter. The only way I know how to do this currently is: ./foo '' '' '' '' '' '' '' 'bar' Is there ...
2
votes
2answers
420 views

grep works fine in command line but returns nothing in script

I'm trying to write a small script to get me list of files that match certain criteria into a file. #!/bin/sh cd /var/www_data/patch/ grep --include=\*.{php,ini,conf,sh} -ril -P ...
1
vote
0answers
389 views

script started in .xinitrc stays in processes

I have made a little startup bash-script to run before my wm starts. Unfortunately after X and WM is started this script is still listed in the in htop and I don't have a clue why... this is the ...
0
votes
0answers
246 views

Script to compare directories and move files (like rsync)

I use rsync to sync data between two servers. If I completely rebuild the directory structure, rsync cannot understand this and will attempt to recopy everything. I am aware that Unison is capable ...
1
vote
2answers
895 views

Pass parameter from one shell script to another

I have two shell scripts namely test1.sh and test2.sh I have to call test2.sh from test1.sh For test1.sh I need to pass one parameter as a command line argument and for test2.sh I need to pass a ...
1
vote
2answers
856 views

make `find` return with a non-zero exit code if error occured

Why am I seeing the following: $ find -not -exec bash -c 'foo' \; -quit bash: foo: command not found $ echo $? 0 This is a reduced version of the actual script I am using which I post at the end ...
6
votes
2answers
263 views

bash crashed with for loop [duplicate]

The question may be trivial but with this simple for loop for i in {1..10000000}; do echo "$i" line >> file done my shell crashed after some elaboration time (the tab in the terminal emulator ...
4
votes
1answer
401 views

How to catch a signal in command line?

I asked this question. SIGPIPE signal is generated to stop the execution of the command as told in the answer. But how do I capture this signal and gracefully terminate the command? The command exits ...
6
votes
3answers
8k views

Test if telnet port is active within a shell script

I am trying to create a script to test whether it is possible to login via telnet. I do not want to really log in; therefore, expect is not needed. I just want to see if I am able to get a login ...
2
votes
4answers
3k views

Error: ambiguous redirect while transferring output to command

Output to redirect in script: 511@ubuntu:~/Unix/test$ ls -ltr |awk '{print $9}' default.txt dfah.txt fruit.txt fruit_prices.txt dfh.txt header.txt testfile.txt topoutput.txt Script written on shell ...
5
votes
4answers
636 views

extract lines according to a particular column

I have a CSV file like CK,ck XYZ,xyz,xyzs ABC,abc,abcs PQR,pqr,pqrs LMN,lmn, IJK,ijk, I have to check if something is written in column 3 except whitespace, then display the whole line.the output ...
2
votes
3answers
123 views

When was the script started?

What I want is, -bash-3.2$ ps -aef | grep 29137 jeeadm 9794 1190 0 09:22 pts/2 00:00:00 grep 29137 jeeadm 29137 1 0 Sep02 ? 00:00:21 Java Second Row, Fifth Column entry, as in ...
3
votes
3answers
2k views

Determine maximum column length for every column in a simplified csv-file (one line per row)

To determine the maximum length of each column in a comma-separated csv-file I hacked together a bash-script. When I ran it on a linux system it produced the correct output, but I need it to run on OS ...
0
votes
3answers
446 views

Stat usage in truss command?

I want to get the access time and modification time of the file in unix solaris machine. The `stats command was not found in that solaris machine. Could you please suggest which is the alternative ...
-1
votes
1answer
60 views

How to do calculation on eval variables in shell script

I want to do mathematical operations on eval variables in shell script, but it is not working. query=first eval avgOverall$query[1]=28.5 avgOverall=$(("`eval echo '${avgOverall'$query'[1]}'`+1")) | ...
3
votes
1answer
88 views

Save lines to different files based on the date

How can I force a re-evaluation of this each time? cat > $(date '+%H-%M-%S').log So that when I first output something it gets written to one file, and after a few seconds I make another ouput ...
1
vote
3answers
701 views

rename files with rename command

Please advice what is wrong with the following command find /tmp/dir -name "* *" -type f | rename 's/*/fixed_/g' remark - I prefer to do that with one command not loop syntax What I want is to ...
1
vote
1answer
1k views

Adding Text After Specific Line of File in Bash Script

I have a txt (ip.txt) file that contains IP addresess. I group them under TCP and UDP. File excerpt is below: #TCP 162.298.38.930 162.298.38.931 162.298.38.932 #UDP 162.298.38.930 162.298.38.931 ...
1
vote
1answer
157 views

Why is the output of this paste command split on separate lines with indents?

I was trying to merge files using either of these commands: paste data_{1..2}.txt > 1_2.txt paste <(awk '{print $1}' data_2.txt ) <(awk '{print $1}' data_2.txt) > 1_2.txt But the ...
1
vote
2answers
82 views

Using sed with herestring (<<<) and read -a

I use sed with <<< and read to assign all words in a string to variables. What I do is: read -a A0 <<< $(sed '2q;d' /proc/stat) Hence, sed reads the second line of the file file ...
2
votes
1answer
1k views

Storing whitespace in a shell script variable [duplicate]

I need to store specific number of spaces in a variable. I have tried this: i=0 result="" space() { n=$1 i=0 while [[ "$i" != $n ]] do result="$result " ((i+=1)) ...
-1
votes
2answers
150 views

Searching out a pattern from Logs

The format of the logs is in this manner: Junk Junk Junk : Junk Junk Junk:IP/Port Junk Junk I want to search using the IP and the output should be only the IP/Port part of each line in that log ...
0
votes
1answer
1k views

How to start several jobs in different screen sessions in a Bash-script?

The programm I want use can be started via ./myprogram < input_part1.txt > output_part1.txt How can I start four jobs of myporgram in a BASH-script where each job runs in a separate ...
1
vote
1answer
171 views

Global variable for every script

I want to declare a variable in such way that every script can access and alter its value. I have written a script that set the value of a variable called flag on exit and I am using a crontab entry ...
0
votes
0answers
36 views

Zsh script cannot find screens

I have created a zsh script launching many screens in detached mode with particular names and running particular processes in them in order to automate some data analysis in high energy physics. ...
1
vote
1answer
182 views

Zsh script how to concatanate array elements with string

I have written a zsh script to automize an analysis in high energy physics and now I would like to use an element of the one of the defined array some string and another element of some another array ...
2
votes
1answer
440 views

How to print a bash variable that has an array as value

I wrote a script for my dwm statusbar. One part of it is finding the current cpu usage for every single core on my system. I figured out a way myself but I would need some help fixing a bug in this. ...
2
votes
4answers
5k views

How to get cpu usage for every core with a bash script using standard *nix tools

I'm writing a bash script to print system stats to my dwm status bar using xsetroot. Everything works as expected. What I'm currently missing is an easy way that just uses standard *nix tools to give ...
1
vote
1answer
537 views

How to ensure a bash script is executable via web without being in /cgi-bin directory?

My document root is /0/ i do not have any cgi-bin directories. this is my virtual host with apache: Listen *:80 DirectoryIndex 1 <VirtualHost *:80> DocumentRoot /0 ServerName domain.tld ...
1
vote
1answer
331 views

What does this `cat` statement do?

I'm new to Linux and trying to figure out what this statement in a Bash file does. I think it combines stdout, stderr and output it to the file $log is pointing to and append the multiline string to ...
2
votes
2answers
1k views

Search for a string in the output of a command

I'm stuck with a simple script. I want to run tracepath on multiple address and to find if some IP is contained in the output of the tracepath. For now I have the following: if tracepath -n ...
1
vote
1answer
206 views

How to extract values from a file using pattern(s) from a column in another file, and insert such values as a new column to the latter?

I sample "winning" sets of 60 game cards such as this one and extract the card names and count and format it for use with some software. The output format is: ...
2
votes
2answers
321 views

Sed find and replace with slashes

I am having trouble using sed find/replace with slashes in the find parameter. Sample contents of test.sh str=$(sed -n '/^user:/p' /tmp/shadowtest) # find "user:" line in /etc/shadowtest ...
1
vote
3answers
246 views

Bash script in ( set -x ) mode does not display what “cat” command does. ( contents of it )

in this bash script.. it simply shows.. +cat as it runs. #!/bin/bash set -x cat > /test << "EOF" a b c d EOF but i rather show everything that it does . including the a b c d ...
0
votes
1answer
342 views

Running shell script on cluster in parralel

I thought dsh(Distributed Shel) will be a good option but when i ran my shell script across my nodes, I didnt get expected output, dsh -aM -c bash /home/cloudera/bash_script.sh server2@x.x.x.110: ...
1
vote
0answers
113 views

Bash script for opening screens and compiling the same file

I have written a bash script to initiate separate screen sessions and run a command in each of them that compiles the same C++ source file in ROOT (an object-oriented data analysis framework ...
1
vote
4answers
316 views

How can the following script be explained?

Code: #!/bin/csh if ( A$1 == A ) then echo "" echo "LIST <name>" echo "" exit endif .............. Ok this is a sample from a bigger script I got. The scripts starts with ...
0
votes
0answers
237 views

Run Xserver as root

I am working with an ARMStone a9 board which has iMX6 linux kernel. I am doing an embedded application in which I have to show a video from Ipcamera. The thing is that I attached the screen to my ...