Tagged Questions

Questions about bash only, as opposed to other Bourne/POSIX shells. For all Bourne/POSIX-style shells, use the /shell tag instead.

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0
votes
0answers
16 views

Editing lines in a file using a bash script?

I am creating a bash script that installed VSFTPD / FTP. After the installation some configuration is required in the "/etc/vsftpd/vsftpd.conf" file. This includes making sure the following lines are ...
1
vote
2answers
56 views

Sort files according to their extensions

I have made a script that will sort files according to their extension and place them in the proper folder. For example, place abc.jpg in the directory jpg. #!/bin/bash #this script sorts files ...
0
votes
2answers
18 views

How do run MYSQL scripts from a shell script with bash variables?

Im making a script where I connect to a database, look for a value and then if that value returned something then I will do something else. ip=$("variable is defined here") Then I connect to the ...
3
votes
2answers
97 views

single quote within double quotes and the bash reference manual

In section 3.1.2.3 titled Double Quotes, the bash manual says: Enclosing characters in double quotes (‘"’) preserves the literal value of all characters within the quotes, with the exception ...
12
votes
2answers
717 views

How can variables use “~” for cd'ing?

How can I use a variable - $BASE in my cd. I tried the following but I get an error $ cd ~/z/repo_1_ruby_193/ 23:23:57 durrantm Castle2012 /home/durrantm/z/repo_1_ruby_193 $ BASE="~/z" 23:24:03 ...
0
votes
0answers
44 views

(Solved) Bash Graphical uninstaller using a tool to make graphical my script [on hold]

I have a problem with logic on this part of my script, I can't see my fault. . Basically the script must be do the follow: Well when i click "Yes" its "Yes" when i click "No" , its "Yes" , i dont ...
0
votes
0answers
17 views

Bypassing the security message in Debian 7 when creating a bash script? [duplicate]

I've created a bash script which involves the installation / update of wget. As a result there is also a message from Debian showing the following: wget (1.13.4-3+deb7u2) stable-security; ...
1
vote
2answers
38 views

Oneliner which prints groups and their numbers which start with a '1'?

I have to write an oneliner which print system groups and their identifiers, for all groups whose identifiers start with '1'. For example, the result of cat command on /etc/group is this: I must ...
0
votes
0answers
14 views

Should all other versions of BASH be uninstalled after patching with the latest version?

My system (slacko puppy 5.7) still tests positive for shellshock after installing the latest version available (bash-4.2.053) I see that old versions are still installed (bash4-4.41_spup and ...
1
vote
2answers
118 views

How to grep for something that's in an environment variable and has a forward slash?

I want to grep a file, and I want to get all the lines that have a certain environment variable (to be exact, $PWD). Of course, using just cat file | grep '/'$PWD'/' is not working, since $PWD ...
1
vote
0answers
26 views

Having problems running a script thats built up through the script [on hold]

I am currently making a script that sets variables and then runs a script. Here is a bit of what it looks like: #!/bin/bash xml='<This,is,hidden,because,of,personal,information><Id>' ...
4
votes
5answers
149 views

Calling multiple bash scripts and running them in parallel, not in sequence

Suppose that I have three (or more) bash scripts: script1.sh, script2.sh, and script3.sh. I would like to call all three of these scripts and run them in parallel. One way to do this is to just ...
3
votes
5answers
72 views

How to show distinct directories on find?

I want to find all directories containing, for example, files named *.txt. but the output must not contain duplicates. How to do it?
1
vote
2answers
38 views

Why double ampersand chained conditions runs in background together the last one?

I have some conditions for some background job to run: condition-command && condition-command && background-job & The problem is: I want the conditions to block until the job ...
1
vote
0answers
15 views

Updating a bunch of Macs via SSH. Could use some help

all. I'm working on a script that'll be running from our Mac server, and it will (hopefully) update all of our Macs via Munki (repo is on the same server) and the built-in softwareupdate command. ...
4
votes
4answers
149 views

How to capture command line input into logfile and execute it at the same time?

Let's say I issue some commands on the command line: #capture what follows $ echo "foo" foo # don't capture $ echo "bing" bing # capture again $ echo "bar" bar How can I log commands selectively ...
2
votes
1answer
20 views

Problem with either su username -c “./script.sh” and sudo -u username bash -c “./script.sh” and Java classpath

I am seeing some strange behavior that has led me to wonder how the environment differs when running either of these 2 commands, versus using su username and then running the commands as the user one ...
1
vote
3answers
60 views

0 byte file created in a simple script

I have a script as below: #!/bin/bash df -k | tr -s " " "," | awk 'BEGIN {FS=","} {print $1,$5}'|sed 1d > file1.txt while read partition percentUsed do if [ $percentUsed > 75 ] then echo ...
0
votes
2answers
49 views

select a file under a directory? [on hold]

In bash, when being under a directory, how can we select a file or subdirectory without actually typing its name or even part of its name? Is there a way to enumerate or alternate the files or ...
7
votes
3answers
293 views

output to file, then use file for input

Is there a shorter way of writing this? Basically output a command to a file, then use the file as input for the next command. I also want to keep the file to view afterwards. cmd1 > verylong.txt; ...
0
votes
1answer
13 views

Scope of shopt options in cron script

I have a bash script that is run nightly in a cron job. It needs to do case insensitive file matching, so the script calls shopt -s nocaseglob I want to make sure this does not affect other cron ...
2
votes
1answer
44 views

Bash Array Comparision

Within a bash script, I am building two dynamic arrays. And I want to construct another array with difference of two. Example: array1=("aa-1234|safsf|sfsfs" "aa-2345|sfsfs|n0sfm" ...
2
votes
3answers
207 views

Bash File existence test is always true

I have the following lines of bash script to test whether a file exists: MYAPPPATH=$(find $APPDIR -iname myapp* -print) if [ -e $MYAPPPATH ] then echo "File exists" fi However when file ...
3
votes
2answers
27 views

How to print a range of IP addresses with Linux seq command

How can I print a range of ip addresses on linux command line using the "seq" command? For eg: I need seq to print a range of ip from 10.0.0.1 to 10.0.0.23 . Seems like the period in between the ...
5
votes
3answers
535 views

Shorter command for deleting files

Our web server was originally maintained by a different company. They wrote a short script to clean out cache files. Their file has several lines that read like this: /usr/bin/find ...
3
votes
0answers
70 views

Bash Script - Wget Graphical Download Progress

I'm trying to port this code from wget + zenity to wget + kdialog. The code with zenity: #!/bin/bash # Start wget | zenity # Note the & at the end of the pipe, this allows the script to continue ...
3
votes
3answers
103 views

Why is my script calling multiple functions? [duplicate]

I am new to writing scripts in bash. My script is simple, I have a few sets of scripts that I've written to make setting up linux very simple. So I have made those scripts into separate functions ...
0
votes
1answer
11 views

How to script with systemd-cgtop?

The manpage for systemd-cgtop says that if there is no attached tty it will do one iteration and then print it out, saying that this would be useful in scripts. However when I try to do this from a ...
1
vote
1answer
27 views

bash completion: how to complete a list of hosts for a specific argument?

My programm can have the following format: <command_name> <arguments> <options> -hosts <host1> <host2> ... <hostn> (<more_arguments>) ... I am trying to set ...
2
votes
2answers
54 views

Inputting user input automatically through bash script? [duplicate]

I am creating a bash script which creates a user and sets a password. When the command "passwd user" is run it requires the user to enter a password and stops my script. Is there any way to fulfill ...
1
vote
3answers
39 views

making 4 out of 1 file with awk

i have large list - text file with 1 column of numbers (length=14). Numbers have 4 difrent prefixes 00001-00004. how do i split 1 list to 4 diffrend files. 1 file shoud contain list of numbers with ...
0
votes
0answers
13 views

Need explanation on an if statement with non understood condition [duplicate]

I came across this if statement which escapes to my understanding. Could anyone explain it to me? if [ "${-#*i}" != "$-" ]; then......
2
votes
2answers
41 views

Bash extended globbing

I'm unable to show JUST ONE file from the output of ls using bash extended globbing. From info bash If the `extglob' shell option is enabled using the `shopt' builtin, several extended pattern ...
1
vote
1answer
44 views

Concurrency problems with GNU parallel

My scripts are having trouble with correctly running things in GNU parallel. I have a sub_script like so (all these are actually simplified versions): #! /bin/bash input=$1 # input is a date in ...
1
vote
2answers
40 views

Save AWK FNR as a Bash variable to continue search from the line

I'm trying to get to run this on a sorted file. This returns the last line which is less than or equal to the given value comparing the first 9 characters. This would be done multiple times and VALUE ...
1
vote
2answers
32 views

Store stdout in variable and send command to background

I have a command in a bash script which I want to capture the output of and then send it to the background. How do I get this done? The following doesn't seem to work (it keeps blocking and outputs ...
1
vote
3answers
52 views

Generate networking configuration files using sed and bash

I am a bit rusty on my scripting abilities and am trying to find a good starting point for creating a script that creates files (generating new file names) and edits the IP address in the file by ...
5
votes
3answers
270 views

How to iterate a zero padded integer in bash?

How does one iterate a string with the form "[A-Z][0-9]*" Or for example: "A000001"? After receiving the variable I split: current_=$(mysql -h"$mysqlhost" -u"$mysqluser" -p"$PASS" "$DBNAME" -se ...
-3
votes
0answers
72 views

Drawbacks of UNIX [closed]

I have been hearing a lot about the advantages of linux and other *NIX. These Range from developer productivity, Free software (in case of GNU/Linux)to high stability and security and so on. I believe ...
1
vote
2answers
47 views

syntax error in conditional expression

I am writing a script where I am using the combination of logical 'OR' and logical 'AND' statement. This is the script: #!/bin/bash echo "Enter the value of a" read $a echo "Enter the value of b" ...
1
vote
1answer
19 views

Removing mulitple extensions in chrome

I need to remove multiple chrome extensions from several hundred devices. I have a script that will see if a certain extension exists and if it does then deletes the Default folder. How can I add ...
2
votes
2answers
57 views

syntax error near unexpected token `<'

I am writing a script to read the output of a command to variable a and b. This is the script #!/bin/bash read a b < <(awk '/Application Server/ && !seen[$7]++{printf "%s ", $7}' ...
2
votes
1answer
25 views

Problems with find, xargs and egrep

I this is what I what I'm trying to end up with (except working) find ./ -mindepth 1 -type f -mtime +60 -print0 | xargs -0 egrep -vZ 'vvv|iii' What am I doing wrong? $ ll total 0 -rw-rw-r-- 1 ...
4
votes
3answers
52 views

Is there an easy way to change directories from within one duplicate folder structure to another?

On our server, we have several duplicate-ish folder structures for testing, staging, and production. Other than minor changes, the folder structure between all three are generally the same. When I'm ...
2
votes
1answer
30 views

How can I add four spaces before each lines of programs code in terminal

I usually go to stackexchange when I face programming terminal and I spend most of time trying to append four spaces before my pasted programming code. Is there any faster way to do it from a ...
2
votes
3answers
41 views

How to open terminal, split to 9 terminals and switch between them using one script?

I would like to open a terminal, split it to lets say 9 parts (3x3) and execute some bash script. But for each terminal part different script. Can this be done using perl, python or even bash? How ...
0
votes
2answers
43 views

How to list files and directories of a mount point

Given a mountpoint such as /dev/sda1 how can I list the contents of this file system using shell script. My objective is to delete the oldest file in this drive.
2
votes
3answers
59 views

How to sort filenames with spaces in them and concatenate the files?

I have the misfortune of dealing with filenames that contain spaces. I want to concatenate files of which filenames contain spaces. I also want to sort the filenames numerically. Obviously the ...
0
votes
4answers
76 views

Can you put an if statement within an until loop?

We have to make a script with one until loop to repeatedly ask the user for a number. - If the number is not 50, display the message, “Wrong number; try again.” - ask for another number. - If the ...
0
votes
2answers
23 views

Number of occurences of letters in a word?

I would like to find out the number of occurrences of each of the alphabets in a word. Eg input aabbbddd output a@2 b@3 c@0 d@3 How can I perform this using shell script?