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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2
votes
2answers
76 views

How to clear the input in Bash

I have a bash script that is reading quite a bit of data /dev/random. I need the user to type randomly to seed the random daemon. However once the script completes everything typed will get dumped to ...
1
vote
0answers
28 views

Can I change uuid for network interface in ifcfg-eth* using uuidgen?

I'm creating a script which configuration the network interfaces. The script which generates /etc/udev/rules.d/70-persistent-net.rules and names interfaces to my preference. In CentOS 6.5, my ...
5
votes
2answers
68 views

“command | less” vs “less <(command)”

A common "idiom" for viewing large amounts of command output is to pipe it to less, via command | less. However, it's also possible (perhaps only in bash, haven't tested in other shells) to use the ...
1
vote
3answers
57 views

Creating an alias for a bash script

So I have tried experimented and created an alias in .bashrc. However, when I test out the command I get: [rkahil@netmon3 ~]$ menu -bash: menu: command not found Here is what I have in the .bashrc ...
0
votes
0answers
28 views

bash script loses readonly value after first time thru loop

I have a bash script which seems to lose the value of the readonly constant after the first time thru the for-in loop. For example: #!/bin/bash readonly DIR="./groups/" for output in "${array[@]}" do ...
0
votes
1answer
39 views

Test firefox in a loop

I would like to simply bash the following: start firefox, test it, kill its process if it does not work and restart it; or stop the script once for all if it works. Actually I need a awk sentence to ...
1
vote
1answer
45 views

Memory buffer in a bash script

I have recently finished a script that will ask for a hostname and automatically take the argument of the function and ssh into one of my work servers. Here is a copy of my script: #!/bin/bash echo ...
7
votes
4answers
242 views

How can I suppress the space between generated arguments during brace expansion?

I used the following command to create a list of URLs that I want to test: echo -e ...
3
votes
0answers
18 views

Errtrace and local

I am using the following script: #!/bin/bash -Eu trap 'echo Hi' ERR exit_failure() { echo "Hello, World!" return 1 } sub_failure() { res=$(exit_failure) } sub_failure It results in the ...
0
votes
1answer
44 views

how do I recursivley grep (or otherwise search for) hex strings

Long and short I'm trying to track down some files left by evil scum on a server. fgrep -r "STRING" /path/here has been working well for finding general stuff. However, how do I search for hex ...
8
votes
3answers
383 views

Creating a Bash script that will execute a program and if it exits without crashing, will run it again

I'd like to know the easiest way of creating a bash script that will run an app in MacOSX (it's a UNIX based system so I assumed this was the right place). wait for the program to exit. If the exit ...
9
votes
3answers
83 views

Bash autocomplete with vim command

In bash, autocompletion of paths has recently stopped working when issuing vim commands where the path is deeper than two directories (it continues to work as expected with other commands, such as ls ...
6
votes
2answers
426 views

Why is `tac file | grep foo' (piping) faster than `grep foo < <(tac file)' (process substitution)?

This question was motivated by "Reverse grepping", about grepping a huge file from bottom up. @chaos said: tac file | grep whatever Or a bit more effective: grep whatever < <(tac file) ...
3
votes
2answers
31 views

bash 'nounset' on sub-shell/child doesn't force main script to exit, how to workaround that globally?

With this script: tstNounset.sh #!/bin/bash set -x set -o nounset;set -u echo `echo $str` function FUNC1() { echo $str; };export -f FUNC1;bash -c FUNC1 function FUNC2() { set -u;echo $str; };export ...
5
votes
0answers
104 views
+50

Bash inside Vim not working properly

In MacVim I'm using Conque to run bash commands inside Vim. I have a problem with the text navigation while using Conque. If I'm at the end of a line of text and press down Alt← I skip a word to the ...
0
votes
0answers
54 views

Mirrored Linux Commands [closed]

I've encountered two incidents where commands (or logic flow) is given forward and backwards In bash scripts: if ... fi (use to closed an if-statement) and in GNU/Linux command line: cat; tac (cat ...
5
votes
3answers
101 views

Run program with environment set to variables in a file

I would like to run a program (in this case Python) with only the environment variables defined in a file, say vars.env: FOO=bar X=12 Here's a simply Python script that prints the environment: ...
1
vote
0answers
15 views

Mirrored Linux Commands [duplicate]

I've encountered two incidents where commands (or logic flow) is given forward and backwards In bash scripts: if ... fi (use to closed an if-statement) and in GNU/Linux command line: cat; tac (cat ...
3
votes
1answer
44 views

How do I stop a bash shell PS1 color to stop at the end of the command?

So simple question really, I have a custom PS1 colour where I have the actual shell commands in a distinct colour, just so I can quickly see what commands I typed and separate it from the command ...
2
votes
2answers
29 views

I seem to be “losing” this prompt. What is happening?

I ssh into an ubuntu 12.04 cloud server and start a web server like this (w/ bash): $ nohup python tserver.py & [2] 2122 $ nohup: ignoring input and appending output to `nohup.out' After I run ...
16
votes
2answers
442 views

How to retrieve lost aliases?

Let me start by saying I know this was dumb. Time and Linux make fools of us all. I made an echo command to my .bash_aliases file and erased all of my aliases, except the test alias. However, I ...
1
vote
2answers
169 views

How to iterate through multiple file extension without caring about case sensitivity?

I've seen various topics on how to iterate through multiple file extensions but in most case, the list is defined. example: for file in ${arg}/**/*.{txt,h,py} do .... done As can be seen, ...
5
votes
3answers
181 views

How to iterate through a list of files with spaces that is sorted (case insensitive)?

I am doing this in OSX which uses bash but obviously, not all bash conventions are used so hopefully your suggestion is available to me :) I have the following files fun bar1.txt Foo bar2.tXT ...
-4
votes
2answers
91 views

“bash: [: : integer expression expected” [closed]

I want this function to return one random word if there aren't any command-line arguments. I am modifying linuxconfig.org's random-word generator to run even when #$ -ne 1. function random-word { ...
2
votes
1answer
26 views

Fetching Remote Windows System Information From Linux Server

I need a script/command that would fetch Windows System Information (Host Name,User Name, Domain, OS Info, Hardware Info, Memory Info, processor Info, etc) by running it on a Linux Server (RHEL 6.5 ...
0
votes
1answer
38 views

Faillog - unsuccessful login count in Motd

I wish to include a count of failed login attempts whenever a user logs in. I've created: /usr/local/bin/dynmotd which contains #!/bin/bash FAILLOG=`faillog -u` echo -e " $FAILLOG " and ...
2
votes
3answers
93 views

Aggregate and group text file in bash

I have a big text file(with 5m lines) in this format(4 columns, separated by ;): string1; string2; string3; userId The first 3 strings (SHA1s) form a single ID, called appId (so it can be ...
6
votes
3answers
334 views

How you stop 'wget' after it gets a 404?

If you use brace expansion with wget, you can fetch sequentially-numbered images with ease: $ wget 'http://www.iqandreas.com/sample-images/100-100-color/'{90..110}'.jpg' It fetches the first 10 ...
3
votes
1answer
62 views

Is there a way to pass a variable from an awk statement to a bash function as an argument? [closed]

I am trying to look a for some specific values from (such as 1 or 4 and 2 or 3) a text file using an awk statement in a bash script. If this value is found in the file (within the awk statement), then ...
5
votes
1answer
59 views

Linux: $SSH_CONNECTION is set even without SSHing to the server

I have a remote server and I am writing a script in the server and want it to fire only when I SSH. I thought of using the $SSH_CONNECTION and $SSH_TTY for this purpose. I found out that when I have ...
4
votes
1answer
81 views

PS: what does “ps -o comm= -p $PPID” do

I have a script which does ps -o comm= -p $PPID. The explanation says this gets the parent process name. From the man page I found out -o means user defined format, comm means command and -p means ...
1
vote
2answers
43 views

How to determine the newly closed file within a continuous audit log rotation?

I am attempting to find the best way to determine when the second file (of a matching criteria) is created. The context is an audit log rotation. Given a directory where audit logs are created every ...
6
votes
2answers
68 views

Passing arguments from a file to a bash script

I' ve got this situation: ./ ./myscript.sh ./arguments.txt ./test.sh Inside myscript.sh, i have to run the file test.sh, passing to it the arguments contained inside arguments.txt. myscript.sh is: ...
4
votes
6answers
180 views

Finding the number of time a particular number in a file where range also specified

I have a file with numbers separated by ,(comma). In between it also contains a number range like 300-400. Say for example I have a text file, namely testme.txt which looks like, ...
1
vote
2answers
31 views

Using exec and tee to redirect logs to stdout and a log file in the same time [duplicate]

In a bash script, how can I redirect all standard outputs to a log file and tee the output on the screen using exec ? log_file="$HOME/logs/install.txt-`date +'%Y-%m-%d_%H-%M-%S'`" [ -f "$log_file" ] ...
2
votes
1answer
64 views

Asteriks in filename as wildcard not working [closed]

So I have a folder with many files like 20140720.457812.tmp and I try to count how many lines they have, I tried this: #!/bin/bash lines=`more /folder/20140720*.tmp|wc -l` but I get this error: ...
4
votes
2answers
66 views

Replace very long string in files recursively

I have a very long and complex string in many files and I want to remove/replace it recursively. The string contains many slashes, backslashes and spaces and any kind of special signs. How do I do ...
-1
votes
1answer
32 views

Launching a sudo gui from desktop

Environment: CentOS 5.10 on 32 Bit. test.sh: #!/bin/bash cd /dump sudo /opt/java/jre1.7.0_60/bin/java -jar mytest.jar mytest.jar will pop a GUI app in the desktop, username is in sudoers with ...
-4
votes
2answers
58 views

How to print numbers horizontally? [duplicate]

I would like to print something as 5,4,3,2,1. This is my program, but it prints the numbers vertically. numbers=5 i=1 while [ "$i" -le "$numbers" ] do echo “$i” i=$(( $i + 1 )) done Do you have ...
14
votes
3answers
800 views

Where is bash's history stored?

If I run history, I can see my latest executed commands. But if I do tail -f $HISTFILE or tail -f ~/.bash_history, they do not get listed. Does the file get locked, is there a temporary location or ...
0
votes
2answers
66 views

Solution to integer expression expected [closed]

So I when I run this code on my mac there are no errors, and it provides me the perfect output. But when I run it on Ubuntu or CentOS i get the following error integer expression expected ...
2
votes
1answer
71 views

mkdir with date function behaves differently in script

I am trying to create a directory with a timestamp. If I type at the prompt mkdir "$(date +%Y-%m-%d_%H%M%S)" I get a directory named with the date as I would like. If I put the same line in a bash ...
11
votes
3answers
431 views

Comparing two strings in Bash

I have the following if block in my bash script: if [ ${PACKAGENAME} -eq kakadu-v6_4-00902C ]; then echo "successfully entered if block!!" fi The script execution is not entering my if block even ...
1
vote
1answer
53 views

Verify the length of a variable

I've to verify the length of variable read (my script limit to five the characters inserted), I think about something like this: #!/bin/bash read string check=${#string} echo $check if [ $check -ge 5 ...
3
votes
3answers
115 views

“Tuning” tr and sed expression

I have MD5 file which lists filename and MD5 sum in the following way: MD5 (file14n0001.xml.gz) = 04eb2524d271077ec8f1a0021779b171 MD5 (file14n0002.xml.gz) = 07e2b29645e9211cce9daf1ae27e7b99 MD5 ...
2
votes
3answers
44 views

Looking for a way turn multiples commands with same parameter into a one liner

I sometimes end up doing things like: Example: from ~/blah $ mkdir ~/test-tmp $ cp * ~/test-tmp $ cd ~/test-tmp using the destination dir 3 times in a row. Isn't there a way to turn these into a ...
3
votes
1answer
30 views

Openbox pipe-menu script error

This is the weirdest thing. The script works when run from the shell with no problems. When I run it as an Openbox pipe-menu I get the error "Invalid output from pipe-menu". After playing around with ...
2
votes
2answers
318 views

Sudo Su automated login

I want to automate the login process with sudo su. I have seen lot of questions on these, but none of them are working for me. Automate login with sudo and su Here's my what I tried so far echo ...
1
vote
2answers
43 views

Creating Menu list and Executing the Task

I was given the the Task to create a menu in Linux but it appears it's not coming out great. When I select something I want to be able to perform that task then go back to the main menu when I finish. ...
2
votes
1answer
59 views

Why are aliases missing inside of bash command?

When I run in my terminal: alias a list with all my aliases (defined in ~/bashrc and ~/.bash_aliases files) will be displayed on my terminal. That's nice and as expected! But when I run: bash -c ...