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

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2
votes
1answer
485 views

Why is 'kill -9' killing browser as well as server?

I sometimes have to use kill -9 as a last resort to kill my rails server. Unfortunately, I have to do that often enough that I wrote a helper function in my bash_profile to do it. If I do it manually ...
-3
votes
1answer
55 views

How to interleave two files?

How do I take two input files and create an output file that interleaves their contents? For example, if one file contains: 3 4 6 9 1 7 3 4 5 6 3 5 7 9 10 And another contains: a d g e t u v g j j ...
2
votes
2answers
268 views

How to check whether a particular port is open on a machine from a shell script and perform action based on that?

I am running my below shell script on a machine on which c++ application server is running on port 8080 and in the shell script I am executing an URL and stores the response coming from that URL in ...
0
votes
0answers
43 views

Updating data sets from Online databases/Webservice

I want to have an idea as to how to update the data regularly from the source, if its stored locally in your server or local machine.Lets say MySQL database. Source:It will be a webservice data ...
1
vote
1answer
56 views

Handling sed variables with paths in them?

I have an applescript for doing certain things, like search and replace. set lol to quoted form of POSIX path of (choose file with prompt "VälJ Fil") That chooses a file then im doing this set ...
1
vote
1answer
95 views

start-stop-daemon returning always 0 (success)

I have set up start-stop-daemon to start my script automatically case "$1" in start) log_begin_msg "starting foo" start-stop-daemon --start --chuid nobody --user nobody --pidfile \ ...
0
votes
0answers
81 views

Connect Unix and Windows using shell script

SRCDIR="source/directory" TMPDIR="temp/directory" [ ! -d "$TMPDIR" ] && mkdir -p "$TMPDIR" for file in `find "$SRCDIR" -ctime -1 -type f -name "abc*pdf*"`; do cp $file $TMPDIR done cd ...
0
votes
1answer
320 views

Centos - executing a bash script from PHP

I have 3 scripts (I have removed the help_page function from the networkstats.sh script when I pasted here to save some space): api3.php <?php output = shell_exec('/bin/bash ...
0
votes
2answers
84 views

Shell script to work on files in some directory

I am a noob in Linux hence this might come as a silly question. I have a Windows system, so I downloaded cygwin to help me execute Linux/unix commands. I need to execute a shell script on a bunch of ...
0
votes
2answers
203 views

Getting expr: syntax error on index [duplicate]

Using this OF=$(ps fax | grep 'php-fpm: master process' | awk '{print $1}') IDX=`expr index $OF ' '` I get an error. The results of the $OF variable are: 27797 27495 What is the error here? I ...
0
votes
1answer
40 views

Echoing Total Page Number in Bash Script

I have the following script for batch pdf-ocr processing & it works fine #!/bin/sh # apt-get install exactimage tesseract-ocr ghostscript # bash tut: ...
1
vote
2answers
227 views

Shell script: whole directory to the remote ftp server

I am trying to ftp some recording files to a remote server for backup every night. I am very confused regarding shell script. My question / problem is : I want to move the whole folder/directory ...
0
votes
1answer
113 views

Reject SSH connections from unlisted countries, using hosts.allow/hosts.deny on CentOS

I was trying for few hours to make my custom script work when using hosts.allow/hosts.deny, to prevent connections to SSH and other services supporting TCP wrappers from unlisted countries. Example ...
-3
votes
2answers
126 views

Extract certain column from CSV files [closed]

I have a directory with a group of CSV files. All files have the same column headers. I need to extract values in a certain column from all files. The common part in files names is ...
1
vote
3answers
157 views

How to get a response from any URL?

I have been asked to write a shell script To check if a URL is UP/Working or not for my Project. I tried to find some hints over the internet, but whatever I got is about checking whether the URL ...
2
votes
5answers
55 views

Append files with bash one-liner?

Currently I use multiple lines to append content into a combined file, e.g. ./myprogram 1.txt > Out.txt # Overwrite for the 1st file ./myprogram 2.txt >> Out.txt ./myprogram 3.txt >> ...
0
votes
0answers
16 views

I have to calculate values from two files and store the result in output file [duplicate]

I have to calculate values from two files and store the result in output file: in output file each record shows the product of records with same name in input files. file one s1 10 s2 20, s3 25, s4 ...
-3
votes
1answer
85 views

I have to calculate values from two files and store the result in another file — using shell

I have to calculate values from two files and store the result in output file. In the output file, each record shows the product of records with the same name in input files. file one s1 10 s2 20 ...
1
vote
2answers
61 views

Sending most recently created file via Email

I'm trying to send a log file every 24 hours or so via email. Currently I am using mutt for this. You can call mutt like this: mutt -s "Log" -a file_attachment example@example.com I know I can ...
0
votes
1answer
309 views

Copy a file from a remote server to windows home using scp

Is there a way to copy a file from a server to a local folder (i.e. My Documents)? can it be done by scp? I have this script that generate some list. I want this script to automatically copy the ...
2
votes
1answer
90 views

Exit status on core dump

When a process dumps core, does it set any particular exit code? Alternatively, is there a way to detect if core was dumped in a shell script. I have shell script that fires a job which occasionally ...
1
vote
1answer
92 views

Compare file size of multiple files in an array [closed]

Scenario: Ftp site has 100s of files. Once a day, all the .gz files are copied to an AWS site then renamed. Only the date is kept in the file name. Some of the files corrupted during copy. A txt ...
2
votes
2answers
273 views

condition && command + exit

While writing a simple shell tool, I found a piece where I don't know how to get it to work. [ "$#" -ne 3 ] || echo "wrong number of arguments" && exit The above works as intended because ...
2
votes
2answers
75 views

How to escape spaces etc in passed variable, for system call to cp in awk

As the title suggests, this problem has enough layers of complexity to make simple escaping characters difficult for me. I have a bash script which, for a large part, has an embedded awk script that ...
2
votes
0answers
26 views

Tmux log output [duplicate]

Im looking for a solution to an issue regarding tmux. One of my scripts ns2server stopped working recently when running start (using tmux) but not in debug mode (not using tmux). I found that using ...
6
votes
4answers
696 views

Delete spaces, hyphens, and underscores in filenames?

What is a good command to delete spaces, hyphens, and underscores from all files in a directory, or selected files? I use the following command with Thunar Custom Actions to slugify filenames: for ...
2
votes
2answers
216 views

Replace value within single quotes in a line that contains certain word using sed command

I have a line as below in a html file, shahar.push(['remoteUrl', 'staging.zazzercode.com']); Depending upon environment, I want to replace the remoteUrl value with sed command. eg, ...
2
votes
3answers
580 views

Script for testing SFTP login status?

I need to perform an automated backup task that connects to an SFTP server. The first stage involves testing the server connection by connecting to it. To be absolutely sure that it is connecting to ...
1
vote
2answers
82 views

How to add words to an existing column

I have a tab delimited file with 10 columns and in one of the columns (with about 40 million rows), I would like to add a word before the existing entry in each row (same word in each row!) and a ; ...
6
votes
3answers
216 views

Attempted assignment to non-variable?

We can use arithmetic operations inside shell script function: function mess { if (( "$1" > 0 )) ; then total=$1 else total=100 fi tail -$total /var/adm/messages | more } I ...
1
vote
2answers
137 views

Pass a command to ROOT from a shell script and having it stay open

I am writing a bash script to perform some analysis using the program ROOT. I want to run some initial command to load the result of the analysis, then continue using ROOT interactively. The analysis ...
0
votes
1answer
129 views

Launching a program and executing a command in bash script [closed]

How can I execute a command inside ROOT that I launch within the bash script? My aim is to have ROOT execute its GUI file browser and have it open if the user does not interfere with keyboard ...
0
votes
1answer
66 views

Combining multiple functions into a single bash script

Is there a way that I can combine the following commands (the last is a zsh function) into a single bash script? find /path/to/directory/*/* ! -name "*.js" -type f -delete find ...
4
votes
4answers
86 views

Renaming multiple files with rename

I need help renaming files in batch--the other questions I browsed don't exactly address my problem. The names of my files are generated non-deterministically, so I can't predict what they will be ...
0
votes
0answers
44 views

How to capture INFORMIX DB errors in shell script?

I need to capture the informix DB errors like Update failed, Insert failed using the shell script. I am using ksh shell.
5
votes
1answer
594 views

Multi-Threading/Forking in a bash script

I have written a bash script which is in following format: #!/bin/bash start=$(date +%s) inFile="input.txt" outFile="output.csv" rm -f $inFile $outFile while read line do -- Block of Commands ...
5
votes
3answers
61 views

How to put the output of the trailing lines of grep in on-line?

Assuming that I have this file: Thu May 8 15:32:07 2014 User-Name = "Mark" Framed-IP-Address = 0.0.0.0 Acct-Status-Type = Interim-Update Acct-Input-Octets = 95684 ...
3
votes
1answer
385 views

How do I parse a string in bash into variables using a tab as the delimiter and preserve spaces?

I am in the process of writing a bash script to display various statistics, some of which come from a MySQL database. The pertinant code I'm having difficulty with is: read min max rows <<< ...
0
votes
1answer
138 views

Command not working in shell script, but works on command line

I have a shell script that executes the following command: bash -c "screen -dmS node /home/nodejs/bridge/bridge.js" However, the screen is not being started. Typing the command... screen -dmS node ...
3
votes
2answers
485 views

Unable to pass a bash variable as a python argument in bash

For some reason I cannot pass the bash variable $FOLDER as a python argument on the following code. The python script downloads some files from amazon s3. Bash script: #!/bin/bash FOLDER=$(./aws get ...
0
votes
1answer
119 views

Mandatory argument for script to run java program

My script is called: report_startDate It has the following line: $JRE_ROOT/bin/java -cp /home/me/report/config/:/home/me/report/jar/reporting-1.0-SNAPSHOT.jar com.me.project.report.Main $1 $1 ...
3
votes
1answer
57 views

grep upto matching brackets

I have a file like this:- pin(ABC) { a b c d e f { abc } } pin(XYZ) { g h i j k { j k { ...
2
votes
0answers
42 views

background gui process in shell script

In the below script, ivfstudio commands open a gui. Even launched as a background process, I need to close it first so that the next commands are executed. How to make it "really background" ? ...
3
votes
1answer
297 views

two if conditions in for loop bash scripting

I've trying to make two if conditions in for loop. Is it possible this? Now doesn't return anything from second if only two OK from first if. #!/bin/bash servers=("212.39.82.157" "212.39.82.157" ...
1
vote
2answers
70 views

rename a batch of files after reading from a source file

I have a directory full of over a thousand files and the names are bit long (and no pattern found in the naming style). I would like to simplify the filenames. E.g.: ...
2
votes
2answers
82 views

Read Multiple Entries from an Input File

I wrote a program in Fortran that asks me for latitude and longitude and the name of the output file every time I run it. It works great. What I have been meaning to do is run this program for the ...
0
votes
1answer
30 views

What is the term “Usage”?

I am seeing this a lot in the scripts. Is "usage" a command in unix ? I tried googling it but got ambiguous results. Here is an example : ${1?"Usage: $0 ARGUMENT"}
0
votes
1answer
108 views

Connect psftp between Unix and Windows server

I need to transfer files from Unix to Windows server. After creating a folder in the windows server files need to be copied from Unix to Windows. I am using psftp to do this process.So, I am trying to ...
0
votes
1answer
54 views

How to evaluate a variable length in shell script?

I want to write a shell script, in which it will call different command according to the variable length. But I didn't figure it out yet. My unwork script is here: for i in n5 n25 if ${#i} == 2; ...
-2
votes
1answer
67 views

Installation script for OpenERP, creating directories under /var

I would like to know what this code means. I found it on the OpenERP forum. It is supposed to run on Linux CentOS. adduser openerp DIR="/var/run/openerp /var/log/openerp" for NAME in $DIR do if [ ! ...