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• bash watch command with colors preserved

  - by Pawel Goscicki

  From man watch: Non-printing characters are stripped from program output. Use "cat -v" as part of the command pipeline if you want to see them. So how do I use cat -v if I want to see the colored output from: watch ls -al --color

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• None of my bash commands work

  - by Kevin

  I have an Ubuntu 9.10 netbook. I has always run great. Two days ago, I was running as root for a while (~30), and when I moved back to my user account (only other account one this machine), all the commands in ~/bin stopped working. If I try ls, it comes up with "cannot execute binary file". Same with ln, mv, mkdir, clear, cp, etc. They all run as root(which makes sense, different files), but I have no idea why this happened. I don't want to stay as root to move around easily. Any idea?

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• None of my bash commands work

  - by Kevin

  I have an Ubuntu 9.10 netbook. I has always run great. Two days ago, I was running as root for a while (~30), and when I moved back to my user account (only other account one this machine), all the commands in ~/bin stopped working. If I try ls, it comes up with "cannot execute binary file". Same with ln, mv, mkdir, clear, cp, etc. They all run as root(which makes sense, different files), but I have no idea why this happened. I don't want to stay as root to move around easily. Any idea?

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• compare file timestamp in bash

  - by endroix

  How do I compare the timestamp of two files? I tried this but it doesn't work: file1time=`stat -c %Y fil1.txt` file2time=`stat -c %Y file2.txt` if[$file1time -gt $file2time]; then doSomething fi Thanks

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• How to get both PIPESTATUS and output in bash script

  - by Mustafa Serdar Sanli

  I'm trying to get last modification date of a file with this command TM_LOCAL=`ls -l --time-style=long-iso ~/.vimrc | awk '{ print $6" "$7 }'` TM_LOCAL has value like "2012-05-16 23:18" after execution of this line I'd also like to check PIPESTATUS to see if there was an error. For example if file does not exists, ls returns 2. But $? has value 0 as it has the return value of awk. If I run this command alone, I can check the return value of ls by looking at ${PIPESTATUS[0]} ls -l --time-style=long-iso ~/.vimrc | awk '{ print $6" "$7 }' But $PIPESTATUS does not work as I've expected if I assign the output to a variable as in the first example. In this case, $PIPESTATUS array has only 1 element which is same as $? So, the question is, how can I get both $PIPESTATUS and assign the output to a variable at the same time?

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• Bash command substitution not working as expected

  - by Joe Fruchey

  I'd like to view the last few lines of a file, but I want the columns aligned. Basically, I want to disable wordwrap. This is straightforward with: tail $FILE | cut -c -80 But I'm trying to generalize my script for other users, and I'd like to cut to the actual terminal width, which I can get with: stty size | cut -d" " -f2 So I would imagine that I could just tail $FILE | cut -c -`stty size | cut -d" " -f2` but it doesn't work: stty: standard input: Invalid argument cut: invalid range with no endpoint: - Try `cut --help' for more information. (Same results with the 'new' $() expansion.) Now, if I echo it, it seems fine: echo cut -c -`stty size | cut -d" " -f2` cut -c -103 Am I just missing an escape char? Or is this somehow just not possible? Thanks.

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• Network Storage Bash

  - by NickTFried

  I was wondering how to connect to a network storage through the command line on my MacOSX computer, any tips?

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• bash script - spawn, send, interact - commands not found error

  - by Sandeepan Nath

  I my shell script, I am trying to remove password prompt for scp command (as given in http://stackoverflow.com/questions/459182/using-expect-to-pass-a-password-to-ssh/459225#459225) and this is what I have so far :- #!/usr/bin/expect spawn scp $DESTINATION_PATH/exam.tar $SSH_CREDENTIALS':/'$PROJECT_INSTALLATION_PATH expect "password:" send $sshPassword"\n"; interact On running the script, I am getting errors spawn: command not found send: command not found interact: command not found I was also getting error expect: command not found also, then I realised the path to expect was not correct and expect was not installed at all. So, I did yum install expect, corrected the path and the error was gone. But not able to remove the other 3 errors still.

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• Bash Auto-complete Adds Trailing Slash After Filename

  - by AJ

  I recently upgraded my system from Etch to Lenny. Now when I use auto-complete, file names (not directories) appear with a trailing slash on the command line. How do I fix this?

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• Make a Phone ring from BASH through a HUAWEI e220

  - by microspino

  Hello, I have a Debian Linux system with a HUAWEI e220 on /dev/ttyUSB0. I'd like to make It ring a generic GSM phone for just one time. I'm doing this because I'd like to build an embedded system that fires some special behavior by a single GSM phone ring. How can I do It? I've tried wvdial but I receive always a "NO CARRIER" answer when I try to send It an "ATDT XXX-phone-number-to-dial-XXX" command.

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• Difference between sending data via UDP in Bash and with a Python script

  - by Kevin Burke

  I'm on a Centos box, trying to send a UDP packet to port 8125 on localhost. When I run this Python script: import socket sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto('blah', ("127.0.0.1", 8125)) The data appears where it should on port 8125. However when I send the data like this: echo "blah" | nc -4u -w1 127.0.0.1 8125 Or like this: echo "blah" > /dev/udp/127.0.0.1/8125 The data does not appear in the backend. I know this is horribly vague but it's UDP and it's hard to determine why one packet is being sent and the other is not. Do you have any ideas about how to debug this issue further? I'm on a Centos machine.

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• Creating new bash command for Sublime Text 2

  - by Gavin

  I'm trying to get Sublime Text 2's command line alias working. The instructions make perfect sense: Run ln -s "/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl" ~/bin/subl So, in ~/bin, subl exists. However, even when I restart terminal, the command 'subl' is not found. The path specified to the application's subl file is correct, I've verified that. Logging out does not fix it. Any help would be awesome!

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• Ubuntu bash command find -exec

  - by pedro

  Hi...i wanna list every file end at conf, and i wanna to copy to a file the results(with command find -exec) I try this: find -name *conf -exec /home/ubuntu/myfile is this wrong?

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• invalid argument in bash script when port is bad

  - by user273689

  When I do this command I get an error when there is something wrong with the eth3. RESC="1234" RESD="1234" RESO="1234" RESC=$(ssh -q vmx@$1 cat /sys/class/net/$2/carrier) RESO=$(ssh -q vmx@$1 cat /sys/class/net/$2/operstate) RESD=$(ssh -q vmx@$1 cat /sys/class/net/$2/dormant) cat: /sys/class/net/eth3/carrier: Invalid argument cat: /sys/class/net/eth3/dormant: Invalid argument How can I use the invalid argument inside the RESC and RESD variable Thanks

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• What does export do in BASH?

  - by Chas. Owens

  It is hard to admit, but I have never really understood what exactly export does to an environment variable. I know that if I don't export a variable I sometimes can't see it in child processes, but sometimes it seems like I can. What is really going on when I say export foo=5 and when should I not export a variable?

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• rsync bash script to backup specific directories nightly to remote server

  - by Janice Young

  Hello, I am looking for a rsync script that will backup specific directories from my home machine to a remote server nightly. So say: /home/me/Pictures to ssh -p 6587 [email protected]/Pictures. It would be nice if it can look for changes but im not worried so much about the changes aspect is having a script that runs at a certain time of night with cron or however. I have googled and found scripts but those scripts were specific to the operations of those creators. Any help would be happily accepted as the scripted part really throws me off. Thank you, Janice

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• How do I test complex expressions with bash?

  - by router

  I can only do simply expressions like 1=1 and 0=1 test 1 = 1 -a 0 = 1 But how to do complex expressions like 1=1 and (0=1 or 1=1) ?

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• Reverse bash console text flow

  - by radman

  Hi, This is a bit of a weird question and I'm not sure that there is any easy answer to it but I am very interested in finding a solution. So when I work on a linux machine via a console I find that I am constantly staring at the bottom of the screen, as once you have executed a bunch of commands text fills toward the bottom. Now I find that this is decidedly not good for my neck and it would be far better if instead of scrolling to the bottom, the text would scroll to the top instead. So does anyone out there know if there is a way to reverse the direction text appears in a console? (note that i am aware of the clear command) Example: default behaviour user@machine:~$ command 1 user@machine:~$ command 2 user@machine:~$ command 3 user@machine:~$ __active_prompt__ desired behaviour user@machine:~$ __active_prompt__ user@machine:~$ command 3 user@machine:~$ command 2 user@machine:~$ command 1 Running Kubuntu 10.04 using Konsole I realise this is an odd question, thanks for any help.

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• Placement of command line options in bash

  - by Nathan Rambeck

  I just starting using a Mac and have been frustrated that command line options are required immediately following the command so that this works: ls -la /usr but this doesn't: ls /usr -la ls: -la: No such file or directory Is there any way to change this? Or can someone tell me why the placement of options is agnostic on most Linux platforms, but not on Mac?

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• Prefix time to each line of bash command output

  - by neildeadman

  I am running the top command to see details about specific processes. The output is piped to grep like so: top -n 1 | grep jre The output is usually around 4 lines, and I would like to prefix the current time to each line so it would be something like: Before: 2772 deleteme 20 0 2832 1156 872 R 2.0 0.1 0:00.01 top After: 13:46 25-08-2012 2772 deleteme 20 0 2832 1156 872 R 2.0 0.1 0:00.01 top

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• Bash loop to move directories on a remote host via ssh

  - by I Forgot

  I'm trying to figure out a way to perform the following loop on a remote host via ssh. Basically it renames a series of directories to create a rotating backup. But it's local. I want it to work against directories on a remote host. while [ $n -gt 0 ]; do { src=$(($n-1)) dst=$n if [ -d /backup/$src ]; then { mv /backup/$src /backup/$dst; } fi; } ((n--)) done;

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• bash pipe construct to prepend something to the stdoutput of previous command

  - by AndreasT

  I want to use sendmail to send me stuff and want to do it in a oneliner. echo "mail content" | sendmail emailataddres.com Sends it without subject. The subject line must come before the Mail content, so I am looking for something along the lines of: echo "mail content" | prepend "Subject: All that matters" | sendmail emailataddres.com sed and awk tend to be really awkward to use and remember. EDIT:Just to clarify: echo "Mail content" is just an illustrating example. I need to be able to prepend stuff to stdout streams from any source. e.g.: ifconfig, zcat, etc..

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• weird problem with bash

  - by Arcath

  I recently changed my .bashrc and tweaked how my PS1 looks, but now it has a very wierd problem, before the end of the line in terminal (about 2 3rds of the way in) it jumps back to the begining of the line like so: e before itarcath@Highgate][~/.gconf/apps/gedit-2/preferences] how long can a command b My first though was was that it wasnt getting the terminal size properly but tput cols returns the correct value. My.bashrc: http://github.com/Arcath/.Files/blob/master/dotfiles/.bashrc

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• Conditional blocks of code in linux bash

  - by Arek

  Nearly everybody knows very useful && and || operators, for example: rm myf && echo "File is removed successfully" || echo "File is not removed" I've got a question: how to put a block of commands after && or || operators without using the function? For example I want to do: rm myf && \ echo "File is removed successfully" \ echo "another command executed when rm was successful" || \ echo "File is not removed" \ echo "another command executed when rm was NOT successful" What is the proper syntax of that script?

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• Log Files from bash script output

  - by neildeadman

  I have a script that runs (this works fine). I'd like to produce logfiles from its output and still show it on screen. I have this command that creates three files from this blog: ((./fk.sh 2>&1 1>&3 | tee errors.log) 3>&1 1>&2 | tee output.log) 2>&1 | tee final.log This does exactly what I want it to. My only issue is that I create files in my script and copy them somewhere, and I'd like to copy these logfiles there too, which I can't do whilst this script is running. I also wanted to make it easier for any user to run my script, so I created another script to run this script. According to this post (see last post) I can put a . before the script name and I can use variables assigned in my called script from the first script if I use them in the first. It doesn't seem to work though and I can't figure out why or find alternative methods. Can anyone help?

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