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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Prevent certain lines of a script to run as root

Suppose I am writing a shell script that requires root privileges to run, for example- #!/bin/sh ip -s -s neigh flush all ufw enable How can I prevent certain lines of code to be run as root, i.e. ...
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1answer
76 views

Bash script to detect a file modified yesterday and check if its size is above a certain threshold

I'm writing a script to stat all files in a directory, and then find specific files that were created yesterday and tell me if they are larger than a certain size or not. So basically I need this to ...
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1answer
36 views

UNIX Script not reading the folders with spaces [closed]

I have a UNIX script which is supposed to scan all the folders and return the files older than speciific amount of time. I gave the logic as below, but the script is not able to read the folders with ...
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2answers
29 views

Unable to perform a simple multiplication in script

I am havingf trouble performing a simple multiplication in my script. while read A B C do tmp=$A\*$C/100 echo $tmp >> out1.txt done < foo.txt foo.txt: 13721725 99 100 ...
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4answers
49 views

tabs in variable not working

I have this lines that i will insert in a mail called "header". header=" ------------------------------------- Name\tAge\tGender\tAddress ------------------------------------- " Unfortunately, the ...
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5answers
577 views

Bash script: check if a file is a text file [closed]

I am writing a menu based bash script, one of the menu options is to send an email with a text file attachment. I am having trouble with checking if my file is a text file. Here is what I have: ...
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2answers
94 views

while read loop

I have a file like one below var 3 2014 string var1 4 2011 string4 var2 6 1999 string2 var3 1 2016 string6 Then i have this while read loop to compare one of the ...
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1answer
76 views

Need help using Netcat

I have a file on my server that has HL7 messages spread out by a space. Example below. I am wanting to send one of these messages at a time in a continual loop until stopping the script with ctrl+c. I ...
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1answer
60 views

How to automate a webbrowser that supports javascript? [duplicate]

I have to automate the "imitation" of a "human" by using a webbrowser that supports javascript. I need it because there is a javascript link on the website that can be only used if the webbrowser ...
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46 views

CSH: Determine index number of string in an array

I am using csh. Consider an array of arbitrary length: set array = ( abc def ghi ) I have the following variable set var = "def" How can I find $var in $array and determine its index value? I ...
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3answers
75 views

backup script to copy files by its extension

I have created script to copy .png files from one directory to another. Script is as follows: i="`cat /usr/local/app1/default.conf | grep -i values | sed -e 's/\values=//g' -e 's/,/ /g'`" for data ...
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1answer
58 views

How to create a bash script that sees all files in a directory and tells me their size and date of creation?

I'm a beginner in the field of programing/coding. I'm trying to write a simple bash script that will see all files in a directory, and then tell me each file's size and each of their dates of ...
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0answers
27 views

Unable to execute root commands using client-connect option openvpn

I'm using the openvpn option client-connect to run a script when a client connects. The scrit works fine when I use simple commands but when I add commands that need root privileges it doesn't work ...
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2answers
259 views

Correct behavior of EXIT and ERR traps when using `set -eu`

I'm observing some weird behavior when using set -e (errexit), set -u (nounset) along with ERR and EXIT traps. They seem related, so putting them into one question seems reasonably. 1) set -u does ...
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3answers
43 views

printing a series of characters

My ultimate goal here is to generate a block of text that can be used to test out various fonts at a terminal. I want to generate the file as basically an ascii chart. A series of characters from 1 ...
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2answers
33 views

Script to find logs in directory

I have my loop for: for i in 1.34* do if [ -f $i/rela/*log ] ; then echo $i >> /tmp/allog else echo $i >> /tmp/alnolog fi done Is working well. We have different version of releases ...
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1answer
76 views

Host monitoring script with timestamp

I just made this script for host monitoring. The goal is to ping the host and log the output to a file but also to show output to the terminal. If the host is unresponsive it will log the time with ...
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1answer
106 views

Batch Extract & Repack .RAR Files

I'm dealing with a large amount of password protected .rar files which need to be repacked to remove the password. (The password is known.) I was wondering if there was a script to batch/recursively ...
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3answers
111 views

Script to move one filetype and create a subfolder, if it exists?

I'm trying to find a script that would basically look recusively at a directory, and if the script finds file that are .flac files, it will create a subfolder called FLAC in that same folder, and move ...
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1answer
37 views

How to grouped the following variable and command and read 1 by 1

I've following array and variable : httpurl="http://www.nnin.com" firstquery=$(curl -s -X POST -d "UID=user1&PWD=1111" $httpurl) name="firstcust" ip="105.105.0.1" httpurl="http://www.mmim.com" ...
9
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1answer
470 views

Know which process does I/O without iotop

On Linux, I want to know which process uses my disk I/O bandwith. I know I can use iotop but I have a machine where, for various reasons, iotop cannot be installed. How can I manually get that ...
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2answers
141 views

Script to Ping an IP and create a log showing date/time of any fails, times over 500ms, and traceroute any fails [closed]

Like the title says I am trying to make a script to run constantly that produces a log showing ping stats. I want the log to contain and ping fails, times over 500ms and the traceroute of any ...
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2answers
61 views

Substrings in shell script

Am trying to get a substring from a string but am getting the error: ${curr_rec:3:4}: bad substitution #!/bin/ksh get_file_totals() { if [ -e "$file_name" ] then IFS='' ...
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1answer
40 views

Auto disconnect from WLAN if unused

For Nokia N900 there is an app called AutoDisconnect which monitors the WLAN usage and closes the connection if the traffic is very low. I'd like to have something like this on my future notebook in ...
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5answers
1k views

How can I propagate my SSH pub key to a list of servers without having to type my password in over and over?

I was recently given username/password access to a list of servers and want to propagate my SSH public key to these servers, so that I can login more easily. So that it's clear: There is not any ...
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0answers
23 views

Script requesting information upon boot

The idea is to create a script that runs as root upon boot (either before a potential X or GDM starts or after). The challenge is that this script needs input from "the one at the keyboard" - without ...
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2answers
135 views

export PATH permanently [duplicate]

I have exported the PATH but once I switch to a different terminal or reboot Debian, $PATH is reset. Here are the steps I take: ~$ vim scripts.sh #!/bin/bash echo "Hello" I save it as mybash.sh ...
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1answer
103 views

Shell read script for sftp

I have this working: % cat read.sh !/bin/sh file=list.txt while read line do echo "$line" cut -d' ' -f27 | sed -n '$p' > file2 done < "$file" % cat list.txt sftp> #!/bin/sh sftp> ...
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2answers
107 views

Cron job which runs every 5 seconds

I need to create an cron job with the following functionality: The job should go to a particular directory and touch one file every 5 seconds. It should run for only 1 minute. The logic is to ...
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3answers
1k views

How to set Ruby GEM_HOME and GEM_PATH

I'm a NOVICE user of Linux and using Linux mint 17.1 I've reinstalled Linux mint 20 time in last 3 days for that issue but could not fix it I'm trying to install ruby on rails using rvm what ...
0
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1answer
61 views

Take output field data string into variable

I want to grep for some specific lines from a log file, and then capture a specific part of that output in a variable and use it in other commands. The grep command I have is the following, where $1 ...
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0answers
48 views

What's in your script Swiss Army knife? [closed]

I've been using Linux pretty heavily that past few months and I want to up my game. But so far my scripts have been focused on speeding up my development time. I'm looking for scripts that will just ...
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3answers
85 views

Remove special pattern ^M from script which got appended after FTP from windows to Unix

I send a windows file using FTP to an unix system and got appended ^M wherever a new line was intended, and I just want to remove them. One method which I can opt is to run dos2unix command. Can ...
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3answers
2k views

How can I run a program as a root user when my Ubuntu 15.04 machine starts up?

On Ubuntu 15.04 I have this file: /usr/local/bin/myscript (it's a script I made). If I run this command under my account, it will do what I need it to do as a root user: sudo /usr/local/bin/myscript ...
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2answers
84 views

Pipe to my own script

I've recently noticed this message from grep "grep: warning: GREP_OPTIONS is deprecated; please use an alias or script" I receive this warning because --color=always is defined in my .bashrc file. ...
3
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1answer
51 views

Solaris: PKG - Script To Verify All Packages Except for a Few

I'm trying to verify the all packages except for a pre-defined list of packages that I know are going to fail for known reasons. This script is going to be run on all Solaris systems within our ...
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2answers
131 views

Checking if a command is a built-in in ksh

How can I check if a command is a built-in command for ksh? In tcsh you can use where; in zsh and bash you can use type -a; and in some modern versions of ksh you can use whence -av. What I want to ...
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1answer
158 views

Scripteable GPT partitions using parted

I am partitioning eMMC using following commands in the script, parted /dev/mmcblk0 --script mklabel gpt parted /dev/mmcblk0 --script mkpart primary ext4 32MB 132MB parted /dev/mmcblk0 --script mkpart ...
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1answer
261 views

Shell Script Help - Automatically assign users to group

Recently, I have just started to learn linux and I am currently trying to make a shell script that can automate the task of creating user accounts, assigning them passwords and then assigning them to ...
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2answers
83 views

Extracting certain data within a script output file

We have a script that runs several commands and rolls up all the output and inserts in into a log file. One of the commands it runs is "netstat -anp". I'd like to be able to search this file for all ...
2
votes
3answers
147 views

Difference between sh -x and ./ for script execution

So I have a simple shell script. What is the difference between the two commands in execution? Is there a preferred way? $sh -x foobar.sh OR $ ./foobar.sh I found the script executed slower when ...
0
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3answers
84 views

Remove lines in a shell script

I have this file: # more file.txt 2c2 lns-ld-wall-01-t2 old:261,260 4c4 Prive_ORANGE old:258,259 I need to remove all lines like this one 2c2 and this one 4c4. How can I do in a shell script?
0
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1answer
57 views

Filtering Log Output on Separate Lines

I did a recursive grep in a directory to find all files that would match as follows grep -ER "match_string1|match_string2" /path/to/dir/ What I get as output is: ...
2
votes
1answer
54 views

Shell Scripting: Deleting or moving files from one directory that match filenames from another directory

I have a very specific and odd problem to solve. I'm working as a research assistant and I've been producing a ton of figures. In one directory, I dump .pngs to view casually (limited space here) and ...
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2answers
163 views

Parsing a flat file using shell script

I have a file like in following format User:blala Pass:blala IP:***.***.**.** I tried with IFS but it is not working input="/path/to/your/input/file.cvs" while IFS=',' read -r f1 f2 f3 f4 f5 f6 ...
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1answer
28 views

How to execute several lines into a .txt

I am using SSH; In a folder I have the next files: -rwxrwxr-x 1 german german 48 Apr 29 10:45 prueba.txt -rwxrwxr-x 1 german german 23 Apr 29 10:43 script1.sh -rwxrwxr-x 1 german german 23 Apr ...
0
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1answer
49 views

Script for update

I need your help in a script used for update : OLD="int 10" NEW="int 20" i=0 DPATH="/home" for f in $DPATH do sed -i "s/$OLD/$NEW/g" $f let i++ echo "modified:" $f done what i need ...
2
votes
2answers
94 views

Does zsh expansion work differently in non-interactive scripts?

I'm currently working on a pretty simple zsh script. What I often do is something like: mv */*.{a,b} . When I run that within a zsh script, it seems to expand differently and fail while it works in ...
0
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2answers
49 views

Add some text while output to file

Assume I have this command: ./clang-$j.out >> clang-result.txt and the each output for clang-$j.out is a fixed-length hash value (each program per line), however, I want to distinguish them by ...
3
votes
2answers
97 views

Detect and respond to ping in userspace

Is there a way to make a linux system react or do something when pinged from another device, besides just sending a reply (or not)?