Bash scripting is making scripts in the Bash shell language.

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Dealing with a string as file input for a program within bash script

Say I have tool X that accepts only files as input, is there any way to pass input to X as a string without having to write it to file then reading it within a bash script?
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138 views

Is there an automatic way to add group read permissions to “nohup.out” when “nohup” is run?

I run my Java code from bash script using a command like this: exec nohup "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" com.myClass "$@" & Which creates the output file nohup.out and this ...
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3answers
245 views

Looping until background process is done (with `jobs`) doesn't work in script

I'm trying to loop until a background process (launched earlier in the script) is complete. An easily reproducible test case is: ping -c 10 localhost &>/dev/null & On the command line, I ...
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317 views

Why am i getting execute binary file error?

i am getting following email every 10 min. as I own the VPS. I am not expert in linux and am learning to manage linux servers. Please help me why am i getting these emails and how to stop them or how ...
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1answer
134 views

Bash: better way to output to both console and output file than tee?

What I need to display is a log refreshing periodically. It's a block of about 10 lines of text. I'm using |tee and it works right now. However, the performance is less satisfying. It waits a while ...
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376 views

How to execute multi-line ssh command stored in a variable

Context: I'm trying to execute a bunch of commands on a remote machine that I cannot access directly - I first have to ssh into a gateway machine, then ssh from there and run the commands. Basically ...
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81 views

$RANDOM in script vs. on command line

I think I found a really odd bug in Bash's random number generator ($RANDOM). Showing is easier than telling, so here's what happens: The goal is to get random digits. If I execute this, I get 20 ...
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2answers
59 views

simple loop not working

A simple script now="$(date +'%d_%m_%Y')" path="/var/www/vitalii/backups" sites=("site1.ru site2.ru site3.ru") for i in ${sites[*]} do echo "$path/$i" #tar -cvzf $path/$i_${now}.tgz /var/...
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57 views

Spawn new consoles from script and get back to the main console instance

The goal is to use a script to launch and execute a command in n separate window terminal: (I use lxterminal) It works when I copy/pase the following block of commands, It executes each lines ...
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208 views

how to grep exact pattern

I’ve tried several grep / egrep ideas with different options but none worked here. I’m trying to grep exact match of the pattern I’m looking in a log. For example I want only a pattern “ERROR” to get ...
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39 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: 3728.0M(3728.0M)->0.0B(...
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890 views

Require bash script to be run with sudo (not as root user)?

I want to require a bash script to be run as the current user with sudo, but prevent it from being run if it was executed as the root user directly. This is because I'm doing some setup actions for ...
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1answer
2k views

[: -gt: unary operator expected

I have a code, which gives [: -gt: unary operator expected, when the value is empty. Can anyone please suggest or correct me where I'm wrong ? if [ -e $POSFile ]; then # Read last Position ...
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517 views

BASH associative array rearrange keys

I am running into a weird issue with associative arrays in bash. I have the following files in a directory: ls -lart drwxr-xr-x. 3 root root 4096 Feb 9 11:14 .. -rw-r--r-- 1 root root 3275 Feb 9 ...
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44 views

How to detect ips using nmap?

I am currently working on demonstrating Man in middle Attack foe which I am using my phone as a Victim and my PC running ubuntu 14.04LTS as attacker. I am using nmap to ping my phone to check if its ...
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2answers
856 views

Difference when using backticks in double quotes and single quotes in Bash

Why to the following two executions differ in output? (I need double quotes for variables in my eventual command) $ sudo su -c "echo `cat /root/root_file`" cat: /root/root_file: Permission denied $ ...
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185 views

Bash function only works when password manually input

At work I have to run the following function everyday. The function works fine when I am prompted for the password. However, I tried to hardcode my password so that I don't have to enter it in each ...
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319 views

How do I DELETE a comma and a space from a numeric string using a bash script

Folks, I have asked this question 5 times on here and have received 5 separate bits of code from super users that have all *failed. Problem: I have stock information being brought back into a txt ...
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71 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 last_exec_date=...
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47 views

I want to append the name of the file on the top of that file using bash script

I want to add void mainfunction() on the top of a file. I am reading the actual name of the file from another file and the name of the main function from another file. I was using: sed -i 1i void $...
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1answer
155 views

Bash loop through all directories within a directory and if find any instance of string in each directories specific file do this

I have a service that utilizes a unique user specified port for remote connections. I install multiple instances of this service and wrote a bash script to automate the installs. My installer has a ...
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bash: How to use a quoted argument in select

From a command I get some arguments that I want to offer to the user with the select statement from bash in a shell script. The arguments supplied by the command may contain spaces and are therefore ...
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1answer
113 views

How can I use the pipeline output from different commands inside a custom bash script?

I have this simple script: #!/bin/bash # This command removes the last "\n" (line feed) character from the file specified as parameter # # Params: # $1 [FILE_NAME] - the name of the file to trim if ...
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3answers
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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 ...
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1answer
704 views

Bash script to execute jar with parameters and using file path variables

I am trying to run the following bash script and it gives me the following error #!/bin/bash -x jars= $HOME/SelGridProto/selserversidedjars java -jar $jars/selenium-server-standalone-2.44.0.jar -...
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1answer
152 views

Check for Free Space on Linux, email if critical

I just finished dealing with a server which had run out of space, and would like to setup monitoring on it now, to prevent it going critical in the future. What I would like is to get an email sent ...
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2answers
66 views

opening several terminals at once

In my dev environment, I sometimes need several terminals to be open, each running its own script/ a server (rails, django, redis, mongo, consoles, etc) How can I create some shortcut that will open ...
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135 views

Launch a bash sub-shell and expect a command

From a shell script, how can I launch a bash sub-shell for the user & wait for the user to type exit at the bash sub-shell prompt? I tried bash -c expect -c 'expect "exit" {send "Exiting\n"}'; ...
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2answers
59 views

Is there a way to pass arguments via pipe on bash?

Is there any way to pass arguments via pipe on bash? something like: echo value1 value2 | mkdir -p ./$1/$2 The line above would create the directories ./value1/value2 If this is not possible I ...
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1answer
40 views

Move spam emails from directory - bash script

I am trying to write bash script wich can cleanup my whoole server from spam emails that already are present in my client's folders. I would need this script to do, Check recursively directory /var/...
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378 views

Bash on android [closed]

I have a rooted sony z2 smartphone and I'm able to run sh scripts, I also have busybox installed but I'm unable to work out how to run bash scripts, I've tried ls -l /bin/bash from terminal and get ...
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157 views

Without eval command does not run correctly

just something that i can't seem to figure it out. Begginner bash scripter here I wrote a script to accept command line parameters that are later passed to maven Here's is the working version of the ...
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1answer
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i need to pass a string of an output file to a variable so as i can use it globally all over my script [closed]

sample output RETENTION_INTERVAL ------------------ 10080 I need to pass the numeric value "10080" from the output file to a variable .The condition should validate value and ...
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1answer
34 views

Bash script monitor file modification after its closed

It has already been asked here and I have found the solution for the first part of my question. So for the moment I have a bash script (script1) where I evaluate the sha1sum of a specific file (output....
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2answers
42 views

'hhighlighter' wrapper script saying command not found [closed]

I have gotten the wrapper script 'hhighlighter' from https://github.com/paoloantinori/hhighlighter which colors anything you want in stdout. I followed the instructions about installing ack-grep, ...
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1answer
318 views

Append text at the end of a specific line

I have a file with multiple lines. What I am trying to accomplish is add a string at the end of a commando. I have a script that installs a tool automatically. Now some things have changes in the ...
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1answer
195 views

Format terminal output to show apt-get upgrade errors in RED

I have a VERY simple bash script written for my Kali Linux distro so I don't have to run apt-get update, apt-get upgrade, apt-get dist-upgrade, apt-get autoclean, and apt-get autoremove every time I ...
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3answers
243 views

How to open one GNU screen tab for each directory in a list

I have the following script - it sort of works. #!/bin/bash ... define plugins, etc for plugin in ${plugins[@]}; do screen -t $plugin done Want I want it to do open gnu-screen and for ...
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1answer
339 views

Executing PHP file from command line with dynamic parameters

I need to run one script which will take one date as an argument. It is configured using cron to run on a daily basis, but I need to run it for a time range now. The issue is that this will fetch all ...
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2answers
169 views

Use “read” in Bash script with a standard answer

How can I use read with something as standard response, which the user can change though? (a default answer)
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1answer
63 views

Homebrew script to reinstall formulas

I'd like to develop a bash script to capture the currently installed Homebrew formula, then be able to reinstall these formulas in the event that I need to reinstall my OS. I'm hoping to combine ...
2
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1answer
40 views

Unset bash variables referring to non-existent directories

I have a file which is sourced by an application, adding relevant directories to $PATH and $LD_LIBRARY_PATH. This is fine, but it results in somewhat excessive pollution of the $PATH and $...
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1answer
423 views

Detect window's fullscreen status on Linux?

So basically, I'm trying to write a watchdog script, that checks window titles against a list stored in a file. If the window is fullscreen, the script should do nothing and move on. If the window is ...
0
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1answer
73 views

Passing different set of arguments to the different commands in a linux bash script

I am writing a bash script foo.sh that runs too commands bar with first input argument, and baz with the second argument: #! /bin/bash bar "$1" baz "$2" Now I want to make foo.sh more flexible, ...
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2answers
3k views

Update a sqlite database while select into a while loop

There is a bash script that will do "some magic"™ to files which will be referenced to a sqlite database and after doing "some magic"™ the database should be updated. Here are the simplified code ...
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149 views

Unexpected result from sort command of linux bash

I have a file foo.txt with this content: chr1 15 chr11 5 chr11 8 chr1 7 chr2 23 chr1 35 I tried to sort it first according to the first column, and then according to the second ...
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1answer
174 views

How to get status code of program piped to linux dialog command

I am trying to use Linux dialog to prepare simple installer for Ubuntu. The actual command is: dpkg -i package.deb 2>&1 | dialog --programbox "Installing..." 10 100 I want dialog to ...
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2answers
350 views

Restarting process in CentOS if server restarts

I have a VPS with some Java applications (made with "Play Framework") running on ports 9000, 9001, 9002 and 9003. VPS Provider (iPage) happens to reboot servers unexpectedly from time to time, leaving ...
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254 views

`if` statement with stdout && passing xargs through pipe

Say I have a list.txt of files I want to check. cat list.txt and for each file, I want to perform an action cat list.txt | xargs -I {} touch {} But depending on the outcome of the action, I want ...
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1answer
117 views

Does Killing A Bash Process Affect Children Processes [duplicate]

The Scenario I'm automating backups via a bash script. The script is executed via cron. The script archives directories recursively using tar, and then rsync's them to the remote host. Here is a ...