The shell is unix's command-line interface. You can type commands in a shell interactively, or write scripts to automate tasks. Use this tag for questions applying to /bin/sh and most compatible shells (ash, bash, ksh, zsh, …).

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2
votes
1answer
285 views

Delete repeated words between brackets inline

Our input looks something like 2012-04-17 [GBPGBP] 2012-04-13 [GBP GBP] 2012-04-13 [GBP] 2012-04-11 [GBPGBP] 2012-04-11 [GBP GBP] 2012-04-10 [GBPGBP] 2012-04-06 [GBP GBP GBP] 2012-04-17 ...
7
votes
3answers
1k views

Change the color of the file name text

I am writing scripts to initialize and configure a large system with many components. Each component has its own log file. I would like to change the color of the component file name to red whenever ...
1
vote
2answers
711 views

Is there any simple way to change one line in a lot of files?

I'm trying to use PHP CodeSniffer, and here's the result: ----------------------------------------------------------------- A TOTAL OF 3008 ERROR(S) AND 380 WARNING(S) WERE FOUND IN 46 FILE(S) ...
2
votes
2answers
1k views

log remote X session from ssh (PuTTY)

I've googled alot about this and can't find a way to do this (or if it's even possible) I want to log a user on a remote machine in his X session (Gnome) from a ssh in a windows machine with PuTTY. ...
2
votes
1answer
1k views

Where does plink (from Putty package) search for remote commands?

I need to use plink (or something similar if you have something on mind) to get the output from Debian remote machine onto my Windows box. This works e.g. in this case : plink 192.168.1.5 "ls" > ...
9
votes
3answers
2k views

Substituting strings in a very large file

I have a very long series of urls with no separating character, in the same format as below: http://example.comhttp://example.nethttp://example.orghttp://etc... I want each URL to be on a new line. ...
2
votes
4answers
2k views

Change password in headless mode

I am building a script to fully automate a VPS setup, and I need to change the root password. I would like to avoid typing it as the script is running through SSH. Is there a way to redirect an ...
5
votes
1answer
2k views

How to create a confirmation question in Linux?

I have a certain command (git push server-name) that has major consequences. How to require confirmation for this command only? It should ignore white space. The confirmation could be Enter 'yes i am ...
11
votes
4answers
7k views

symbolic link to a directory and relative path

I've created symlink with absolute path to the directory (Blink) and have for example following tree: $ ls -l /tmp/A total 0 lrwxrwxrwx 1 root root 6 Apr 3 12:27 Blink -> /tmp/B -rw-r--r-- 1 root ...
4
votes
2answers
1k views

Can I read and write to the same file in Linux without overwriting it? [duplicate]

Possible Duplicate: How can I make iconv replace the input file with the converted output? I frequently connect to amazon ec2 using their public DNS names ...
4
votes
3answers
726 views

How to skip file in sed if it contains regex?

I currently use the following simplified command to remove trailing whitespace and add a newline at end of file where needed: find . -type f -exec sed -i -e 's/[ \t]\+\(\r\?\)$/\1/;$a\' {} \+ As ...
2
votes
3answers
790 views

loop to paste specific files in different directories

I some directories that contain a similarly named file eg (*Sample_name*.base.coverage.txt). And I would like to paste all of the *base.coverage.txt files together. I have something written, but its ...
6
votes
1answer
244 views

How to run programs with arguments like 'arg=val' (e.g. dd) in rc shell (Linux version ported from Plan9 OS)?

I'm trying to use rc shell (Linux port from Plan9 OS) and get 'syntax error' messages when using programs with arguments like arg=val. ; dd if=/dev/zero of=/dev/null syntax error ; ls --color=auto ...
4
votes
3answers
873 views

Why read works if stdin is redirected to fd4?

What does the following script mean? exec 4<&0 0</etc/XX/cfg read line1 exec 0<&4 It redirects fd0 to fd4, and "/etc/XX/cfg" to fd0. So why does read still work, shouldn't that ...
2
votes
1answer
6k views

How can I delete a hidden folder?

I want to delete many configuration folder in my home user folder but I can't figure out how to delete them. How can I delete a hidden folder?
4
votes
2answers
893 views

Zsh — more intelligent autocorrection

Is it possible to make Zsh stop trying to correct arguments that are not meant to be files with files from the current directory without turning off correction completely or limiting it to setopt ...
0
votes
1answer
197 views

How to use a password as an external variable in shell?

I have this MySQL backup script that I use to back up MySQL databases. Very useful, and it runs on fixed intervals using a cron. However, I need somehow provide this script with the MySQL password. ...
1
vote
2answers
678 views

How does this shell command work?

The following command puts the content of the local id_rsa.pub into the authorized_keys file on the host. But I don't quite understand how cat and | works together to achieve this goal, can someone ...
5
votes
3answers
3k views

Remove many many many files from a folder

I have a folder with 137795 files in it. I need to delete all of them. When I run rm * I get -bash: /bin/rm: Argument list too long. How do I get past this error?
0
votes
1answer
2k views

How to pkill from a script?

How can I write a script that basically just runs pkill -HUP inetd? I want to restart inetd via a script so I can schedule it to run at a particular time. I tried to write it myself, but I'm getting a ...
1
vote
0answers
522 views

Manually setting environment variables for Metasploit

How do I set manually environment variables for Metasploit, when I execute db_driver I get this message: [*] No Active Driver [*] Available: [*] DB Support: Enable the postgresql driver ...
1
vote
1answer
618 views

What is the difference between $var and “$var”? [duplicate]

Possible Duplicate: $VAR vs ${VAR} and to quote or not to quote I assigned a variable var a value as follows: pradeep@pradeep-laptop:~$ var="Pradeep > is > a good > boy" ...
18
votes
4answers
7k views

Four tasks in parallel… how do I do that?

I have a bunch of PNG images on a directory. I have an application called pngout that I run to compress these images. This application is called by a script I did. The problem is that this script does ...
14
votes
1answer
9k views

ls taking long time in small directory

Running Ubuntu, I open a terminal and do sudo bash cd / ls | head -n 1000 And predictably about 20 directories are returned. However, if I do an ls, and don't pipe it into anything, the ls just ...
4
votes
1answer
4k views

Run xterm with login shell or not?

Per default xterm starts an interactive shell. But you can also configure it to start an interactive login-shell. That means that with starting an xterm you get the same kind of shell like logging in ...
30
votes
1answer
43k views

How do you extract a single folder from a large tar.gz archive?

I am using this command on a 5GB archive tar -zxvf archive.tar.gz /folder/in/archive is this the correct way to do this? It seems to be taking forever with no command line output...
4
votes
2answers
274 views

Why 2 linux machine behave differently with command of the same syntax?

I am using 2 machine , which is both Red Hat Enterprise Linux AS release 3 (Taroon Update 2) ( I check it in /etc/*-release ). I checked they are using the same default shell by ps -p $$, which is ...
8
votes
2answers
798 views

How do I add network or user source connection data to history entries?

I would like to modify the history settings for all users on the systems that I manage. I would like it to contain the information from the connecting terminal like from who sysadmin:/ # who sysadmin ...
3
votes
1answer
200 views

How can I pipe a path to pushd?

This seems like it should be easy enough to do, but I'm clearly not understanding something fundamental about piping output back and forth. I'm trying to do something like this: bundle show ...
4
votes
2answers
731 views

List of script( location)s that get run automatically, and when?

Does anybody know (of a resource listing) what scripts are run automatically, and when, from the moment I startup the computer until it's shutdown again. I know several places where I can add scripts ...
3
votes
0answers
344 views

How are you organizing your $HOME? [closed]

I've always wanted to know more about how people (power users and lambda users) were organizing there $HOME. The trend is currently is using xdg-users-dirs which define a set of most used folders like ...
0
votes
2answers
6k views

Trying to set JAVA_HOME in ~/.bashrc

I have added this line at the end of ~/.bashrc export JAVA_HOME=/usr/java/jdk1.5.0_07/bin/java But when I execute echo $JAVA_HOME, I don't get anything as output, I expected ...
2
votes
0answers
108 views

How does << work and what is it called? [duplicate]

Possible Duplicate: Correct textual name for << I am learning about Go and saw this usage I've never seen before (from http://golang.org/doc/install.html): $ cat >hello.go ...
4
votes
4answers
652 views

Get input from editor (vim/nano/emacs/textmate?)

I was just curious if there's a way to get input not from StdIn but from $EDITOR - be it vim, nano, emacs or even a non-command-line-editor (MacVim/TextMate). What are the ...
2
votes
2answers
588 views

Shell script output incorrectly splitting while being passed as an argument to script

Let's say I have the following two shell scripts: #!/bin/sh #This script is named: args.sh echo 1 "\"Two words\"" 3 , and: #!/bin/sh #This script is named: test.sh echo "Argument 1: "$1 echo ...
5
votes
1answer
3k views

Which shell should I learn for FreeBSD and Debian?

I have read many articles that say the official shell in FreeBSD is tcsh, and in Debian, its dash. However, when I either echo $shell (FreeBSD) or env in Debian, it says that the shell is csh in the ...
4
votes
1answer
1k views

Linux sort second last column

I would like know how to sort the second last column ? It has the word "days=" in front of the number. I'm able to get the column with awk '{print $(NF-1)}', but sorting is wrong. 457000 ...
2
votes
2answers
329 views

Shell Prompt Customization? [closed]

I have used oh_my_zsh (and tinkered with bash_it) on multiple systems and have generally been happy with it, though I hate it's auto-correction feature and generally turn it off. My usual shell is ...
2
votes
1answer
657 views

Why dialog doesn't support emacs shell on Debian?

Dialog is a utility that provides dialog boxes from shell scripts, you may have seen them in aptitude during upgrades. When i use Emacs shell (M-x shell) and type sudo aptitude safe-upgrade, i get the ...
4
votes
1answer
2k views

“>/dev/null 2>&1” in `if` statement

I don't understand the below if condition. I know that /dev/null 2 > &1 is sending output to error stream (please correct me if I am wrong). But I don't get it when it is in an if condition ...
22
votes
4answers
23k views

Sorting the output of “find”?

I need to be able to alphabetically sort the output of find before piping it to a command. Entering | sort | between didn't work, so what could I do? find folder1 folder2 -name "*.txt" -print0 | ...
3
votes
1answer
4k views

Linux sort last column

I'm running a script (that I have no control of) to get the following output. I want to sort by the last(3rd) column. Each column is separate by spaces, and the 2nd column includes spaces/symbols. ...
1
vote
2answers
2k views

shell script to execute in root mode

I need execute script that have commands which should be run in root mode. If I put sudo before command then when I run script I see permission denied ( I don't have a chance to write password). If I ...
4
votes
1answer
162 views

What is the tool that allows me to specify arbitrary directories using **

I once saw a colleague uses a tool which allows to use ** to represent any directories. For example: if a file called myfile.java sits deep inside: src/main/com/mycompany/product/store/myfile.java ...
6
votes
5answers
5k views

Convert linux sysuptime to well format date

I want to display /proc/uptime in well format as: DD:HH:MM:SS /proc/uptime give me up time of system in seconds, is there a standard solution that convert seconds to this format?
3
votes
1answer
332 views

Character classes: construct my own

I want to construct my own character class in a script, then modify (and use) it, for example: [:myclass:] contains a, *, \n (as linefeed) and [WHITESPACE]. I want to add all characters to ...
9
votes
3answers
2k views

Is it safe to close shell just by clicking “X” or using “ctrl+d”?

Is it safe to close shell just by clicking "X" or using "ctrl+d" while logged in as root with su or is it safer to close it by typing "exit"? Is there any difference (security-wise) at all or is it ...
5
votes
2answers
5k views

How to execute one command on all files within a folder

Saying, I have this tree and I want to execute ruby on all scripts within the folder. How could I archive through one line of command. ./ ../ rb-script/ sample1.rb sample2.rb
4
votes
3answers
541 views

Why do I keep destroying my text files?

I have destroyed a bunch of non-essential files and I don't know why. I have been executing commands like: tr -sc 'A-Za-z' '\n' > somefile.txt | less there is no output (blank page with flashing ...
6
votes
1answer
170 views

counting the number of occurences in a file of data list

I have a data file, like 7 2 10 9 10 3 2 4 2 4 6 Each line has a single value. I want to count the occurence of each value. For instance, 10 occurs two times in this file. Is there a simple way ...