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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-1
votes
0answers
13 views

How to create a script to run several scripts on different servers

I need to automate the execution of several scripts, and I'm writing a script. The scripts have to run concurrently because they are part of a benchmarking suite. I'm trying to execute 6 different ...
3
votes
3answers
76 views

List the number of lines in files

How can I list the number of lines in the files in /group/book/four/word, sorted by the number of lines they contain? "ls -l" command lists them down but does not sort them
0
votes
1answer
3 views

Virtualbox vboxmanage clone does not show up in virtual machine list

I have a virtual machine that I am cloning with the command line interface to virtualbox like so: vboxmanage clonevm origVM --name origClone However, the clone is added to the directory ...
1
vote
0answers
9 views

Programatically / dynamically adjust SSH session port forwards

I have a workflow where I am trying to do the following: For a given existing SSH session, access the remote machinne and perform a process from which a port is returned (e.g. a remote daemon has ...
-2
votes
0answers
26 views

Scripting multi-volume (GNU) `tar` with pre-defined length of volumes

I've wrote me a little script to test (or extract) a very big multi-volume tar archive (note: created with GNU tar), each of which 00x.tar chunk will fit onto a standard DVD: #!/bin/bash d=$(dirname ...
4
votes
2answers
5k views

How can I make PuTTY compatible with Solaris?

I'm connecting to a Solaris machine from WinXP using PuTTY. When I try to use the NumPad keys for editing a command in Bash (Home, End, Delete) a ~ character is instead printed to the console. ...
10
votes
3answers
229 views

Start a process on a different tty

After about an hour of Googling this, I can't believe nobody has actually asked this question before... So I've got a script running on TTY1. How do I make that script launch some arbitrary program ...
4
votes
3answers
5k views

bash: /home/user/.ssh/authorized_keys: No such file or directory

Create a ssh key: $ ssh-keygen -t rsa –P "" Moving the key to authorized key: $ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys bash: /home/user/.ssh/authorized_keys: No such file ...
76
votes
8answers
88k views

Colorizing your terminal and shell environment?

I spend most of my time working in Unix environments and using terminal emulators. I try to use color on the command-lin, because color makes the output more useful and intuitive. What are some good ...
2
votes
3answers
26 views

How to parse env variable in a quoted string?

I'm having a hard time getting the value of an environment variable ($GHREPO) in a quoted string. Here is the command I'm running. I'm trying to make a directory with the value of ...
2
votes
3answers
1k views

Using a here-doc for `sed` and a file

The title says it all, I want to use a here-doc for sed commands and provide the file to be read and the output file. I've looked at Here-Documents from Advanced Bash Scripting guide but it does not ...
1
vote
1answer
33 views

change a bash script while it is running [duplicate]

I have a script test #! /bin/bash sleep 60 echo hello I ran it by setting it executable and ./test, and while it was running the sleep command, I changed it to #! /bin/bash sleep 60 echo ...
3
votes
1answer
15 views

Bash scripts ran from from gnome/nautilus don't have enviroment variables

In my ~/.bashrc and ~/.profile I have some variables set to some filepaths: export MY_VAR1="/path/to/somewhere" In my ~/bin/ (which is added to my PATH) I have a few scripts that rely on those ...
4
votes
2answers
80 views

Using `case` to handle script arguments

Can I use the case statement to handle arguments? So, using -restart I'd like execute "-umount" and "-mount" #!/bin/bash case "$1" in -mount mount /ip/share1 /local/share1 ;; -umount umount ...
1
vote
3answers
50 views

How to test for unknown commands in shell script?

I would like to know, if there is a way to go through a shell script and getting a warning for every command, that is unknown. I know bash -n for syntax checking, but it doesn't tell me, if there are ...
1
vote
1answer
4 views

Virtualbox list vrde port for vm on commandline

I have a Virtualbox VM that is configured with VRDE for remote access using RDP. I'm familiar with how to set the vrde port, but for a given VM I have not found a way to query the current vrde port ...
7
votes
4answers
323 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
19 views

Confusion about basic bashscript loop - until/done [duplicate]

I have a bash script I'm working on to help with an installer. why doesn't this work? function fn_myFunc(){ local MYVAR=0 until ["$MYVAR" -ne 0]; do whiptail --yesno ...
-2
votes
0answers
32 views

making a delete script and a restore script

I'm looking to create two scripts; one to "delete" a script, and one to "restore" I need "del " where this will move the file located at to the dustbin directory in a way that will allow it to be ...
1
vote
0answers
4 views

Capturing data from a Fluke 1620a via Bash /dev/tcp file descriptor

I am currently trying to develop a script that will connect to a Fluke DewK 1620a Themo-Hygrometer and pull the current temperature and humidity readings from the device. While these devices have a ...
7
votes
3answers
390 views

in Bash, how to not include extra arguments in an alias?

I am trying to do something like alias ftp='echo do not use ftp. Use sftp instead.' just so that ftp will not be accidentally used. But I noticed that ftp abcd.com will cause the command to ...
1
vote
0answers
44 views

Update process name in shell, is it possible?

In C/C++ it is in general possible to do strcpy(argv[0], "new process name"). It's a hack used in malicous software to hide real process name. Is such operation possible via shell? What I want to do ...
0
votes
0answers
41 views

Why does SPACE sometimes not work with more (or less)

Usually with |more I press space to get another screenful. But with some commands space just does nothing, and I need to actually keep doing SPACE-ENTER to scroll forward a screen at a time. Both more ...
0
votes
1answer
46 views

Bash script class path issue with java

jvm.script.sh /opt/scripts/jvm/jvm.script.sh #!/bin/bash JAVA_HOME='/java' PATH="$PATH:/$JAVA_HOME/bin" java -cp ./classes:./lib com.mystuff.bar.foo.myclass & init.script.sh ...
-1
votes
1answer
19 views

how to replace a specific pattern from all files [duplicate]

suppose I want to replace abc with xyz in all files in a directory. How do I write a script for this ?
4
votes
7answers
535 views

Remove everything that is not a 4 character number

I need to remove everything that is not a 4 character number such as 9838, 6738, 1337 or 1889. I though that this command would work: sed 's/....[^0-9]//g' . Means any character in regex, and ...
1
vote
1answer
17 views

'hhighlighter' wrapper script saying command not found

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, ...
2
votes
0answers
23 views

Programmatically get CPUs 'detailed' usage, like top/htop

htop has a great way to show CPU usage. It shows the activity (usage in %) of each cores, and each core gauge is divided into three parts : blue: low priority processes green: normal processes red: ...
6
votes
3answers
4k views

What is signal 0 in a trap command?

I'm following this guide on how to set up passwordless SSH authentication with ssh-agent. To start up ssh-agent the author recommends the following code in .bash_profile: SSHAGENT=/usr/bin/ssh-agent ...
1
vote
2answers
3k views

Use inotifywait to move file when it loads in dropbox folder

I'm trying to find a way to immediately move a file to another folder as soon as it appears in my dropbox on CentOS. I have scoured the internet for some clues but I can't get any further than the ...
0
votes
1answer
23 views

check status process output

I wanted to understand how to create a script sh that allows me to see if an additional script functions correctly. For now this is the script that I created. if /run.sh status echo "$SERVICEXE ...
2
votes
1answer
23 views

Command Line Macros in Comments using SLURM

In my opinion, comments are comments are comments. They should NEVER change program state. Sadly, the people over at SLURM disagree. SLURM requires the following syntax (or something similar) to ...
2
votes
3answers
2k views

cshrc execute bashrc within itself?

My school has our Linux accounts using csh/tcsh by default. I, however, have a lot setup on my home bashrc and I'd like to use that at school. BUT there's also some important stuff that happens in our ...
1
vote
1answer
40 views

Difference between / and // [duplicate]

On the bash prompt one, three or more slashes (/,///,////, ...) are treated as a single slash, whereas two slashes (//) are left as is: 12:07 $ cd / 12:07 $ pwd / 12:07 $ cd // 12:07 $ pwd // 12:07 $ ...
0
votes
3answers
66 views

How to print only certain characters?

I have to translate the permissions of a file this way: r ► c w ► s x ► e Then, I must extract the group of characters which are related to owner group. Last step is to print that group of ...
0
votes
2answers
54 views

Help in starting learning bash script [on hold]

I have just started analyzing sequencing data using Linux. I have created a pipeline for variant calling that includes eight commands or maybe more. I need to paste every command one by one and wait. ...
127
votes
11answers
37k views

Preserve bash history in multiple terminal windows

I consistently have more than one terminal open. Anywhere from two to ten, doing various bits and bobs. Now let's say I restart and open up another set of terminals. Some remember certain things, some ...
15
votes
3answers
5k views

Bash: double equals vs -eq

I am doing integer comparison in bash (trying to see if the user is running as root), and I found two different ways of doing it: Double equals: if [ $UID == 0 ] then fi -eq if [ $UID -eq 0 ] ...
3
votes
4answers
124 views

Get pairs of lines and multiply [closed]

I'm trying to parse an html file for some values using bash. So I've got a big text file with numbers like this 3 2 4 2 What I want to do is get two lines, multiply both numbers and then store the ...
1
vote
1answer
24 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. ...
3
votes
2answers
2k views

Close all file descriptors in bash

Is there a way to close all the open file descriptors, without having an explicit list of them beforehand?
0
votes
1answer
53 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 ...
4
votes
4answers
163 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 ...
1
vote
3answers
3k views

Removing a directory from PATH

I'm trying to compile wxWidgets using MingW, and I have cygwin in my path, which seems to conflict. So I would like to remove /d/Programme/cygwin/bin from the PATH variable and I wonder if there is ...
0
votes
0answers
48 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 ...
1
vote
0answers
58 views

Maintain screen session when executing shell script on boot

Solved: I solved this problem by introducing a delay before executing the script: @reboot sleep 60; /root/start_server.sh On Ubuntu 14.04, I have a crontab entry set to run on reboot: @reboot ...
112
votes
15answers
55k views

How to do integer & float calculations, in bash or other languages/frameworks?

Using echo "20+5" literally produces the text "20+5" What command can I use to get the numeric sum, e.g. 25 in this case. Also, what's the easiest way to do it just using bash for floating point, ...
1
vote
2answers
67 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 ...
3
votes
5answers
75 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?
3
votes
2answers
106 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 ...