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
4answers
26 views

Rename first part of multiple files with mv

In a directory there are these files and more: file1.txt file1.html file1.pdf ... Every file1 should be replaced with newfile: newfile.txt newfile.html newfile.pdf ... I've tried: for f in ...
0
votes
1answer
13 views

Deleted all files in dir, except ones within a json file

I have a static assets server with 1 million+ images sitting in a folder, most of them I don't need anymore. I have a list of the filenames I do still need in a .json file. How in bash can I delete ...
0
votes
1answer
29 views

Remote execution of a file is not working

I'm trying to execute a local file (here /tmp/cmd) on a remote machine (slc05bkt) using SSH. Here's the command I'm trying from a script file: cmd="ssh -v ssuthari@slc05bkt \"bash -l -s\" < ...
0
votes
3answers
35 views

Shell Script to change locale has no effect

I wrote a simple script to switch my locale. If I write each line in the console and execute it, it works without any problem or if I put it in .bashrc. However when I execute the script either with ...
-1
votes
1answer
28 views

error while changing directory using crontab [on hold]

This is my script I am trying to rename the files in folder. rename1.sh ---------- #!/bin/bash cd /home/lanein1/WestonIN7pm/"$(date +%Y-%m-%d)" && rename s/WestonIN/WestonIN7pm/ *.jpg cd ...
3
votes
3answers
162 views

Help with bash script

I am teaching myself bash scripting with the book 'Learning the Bash Shell' by Newbam. I'm getting on OK with the book, but am a bit confused by the following script. It is a script which uses a for ...
1
vote
1answer
36 views

Pass list of directories (that contain whitespaces) to a command in a script

For example, I want to execute the following within a shell script: tar cvpzf /destination/backup.tgz /directory\ one /directory\ two I wish to assign the list of paths (with whitespaces in them) ...
1
vote
1answer
26 views

Start new bash session background

Is it possible to create a command called new_bash that allows me to do the following? new_bash alias test="ls" new bash alias new_command="ls" new_bash test file1 new_bash new_command file1
4
votes
1answer
41 views

How to revert from searching to original command

Following the instructions here, I edited by .bash_profile to enable the up and down arrows to autocomplete what I have typed in the shell based on previous commands. I added to my .bash_profile: # ...
0
votes
1answer
18 views

safe way to redirect some output using exec

I have a script that is rather "noisy". I've been asked to clean up the output so that most of the script's output goes to a log file, and the user just sees the start-up message, and the message when ...
4
votes
3answers
80 views

I have accidentally broken /bin/bash

I just started using Linux. I'm using Ubuntu and I think I made a very grave mistake. I made a script and by some stupid sense I decided to move it to my /bin folder, but I accidentally typed mv ...
1
vote
0answers
9 views

AFP share with local Unix users

I have a Solaris server on which I have a AFP share. I connect from a Mac client to that AFP share with local users from the Solaris server. So let's say I connect to the share with the Alice user. ...
0
votes
1answer
21 views

How to create a custom command in Linux for a wine pdf application?

I'm using Debian GNU/Linux 7.8 and would like to have PDFXCview.exe as the standard application to open pdfs. Opening a pdf using a small executable file including #!/bin/bash wine ...
0
votes
3answers
108 views

How would an administrator of a system prevent himself access to a file for 24 hours?

How would a single administrator go about locking himself out of a file for 24 hours? By "lock" I mean prevent access. I have removed the 'rules' placed on the original post, as it is clear that the ...
21
votes
6answers
2k views

Why does [A-Z] match lowercase letters in bash?

In all shells I am aware of, rm [A-Z]* removes all files that start with an uppercase letter, but with bash this removes all files that start with a letter. As this problem exists on Linux and ...
0
votes
1answer
38 views

What means echo“{@@##}”?

We got a script that we need to understand, and at some point, we got this syntax: if [ "$PASS_CHAINE" = "TRUE" ] then echo "Launching DEGAGEMENT" | SLog cd $INTERFACE_D/bin_cm/deg ...
1
vote
1answer
22 views

OSX: Delete all matching certificates by command-line

Using shell script to delete all matching certificates. I found a list of certificates using: security find-certificate -c "certificatename" -a -Z|grep SHA-1|awk '{ print $NF }' Output is like ...
0
votes
2answers
11 views

Bash parameter expanstion to remove tabs

I've got such a line in script: TATVAR=$(echo $PARAMVAR|sed -e 's/^[ \t]*//') I'd like to shrink this to not to execute additional program (sed), shellcheck suggested to me that i should use: ...
6
votes
3answers
70 views

tell if last command was empty in PROMPT_COMMAND

In bash, from inside PROMPT_COMMAND, is there a way to tell if the user just hit 'return' and didn't enter a command?
-2
votes
1answer
36 views

Restrict bash command for specific user [on hold]

I just searched on this page, but the answer does not meet my idea. My idea is when user called Bob access ssh and run a command, for example sudo apt-get update, then the bash sheell will respond ...
0
votes
1answer
21 views

Queue up multiple videos from Bash Script

-Skip to bold to skip the fluff - I'm new to ubuntu, so still learning the ropes of how bash scripting goes. I've got this code I've been working on, which works great. (side question - can I ...
3
votes
1answer
30 views

chkconfig does not support my script

I have looked and looked and none of the threads I have found are helping. We have a tomcat startup script that we modified slightly for our needs. It works fine on Centos / redhat 6 boxes, but does ...
1
vote
1answer
32 views

Provide three argument to one option using getopts in bash

I am trying to process a command line using getopts in bash. I have to pass three arguments after -w option. For example, -w 1 do loop. It should print one line before and after each line from loop ...
-1
votes
0answers
27 views

how to move directories by date to cooresponding monthly directoires

using bash, how would one move directories with a common name, by create date to a monthly corresponding directory without calling out the source specific create date? #!/usr/bin/bash $SourceDir ...
0
votes
1answer
69 views

Why is sed coming back with “unterminated `s' command”?

So I have a Bash script which looks like this: #!/bin/bash extentemplate=" exten => `$prevchannel`,n,Queue(`$prevchannelname`)\ exten => `$prevchannel`,n,Hangup()\ \ ;`$channelname`\ exten ...
8
votes
4answers
656 views

bash loop with 0.02 increment

I want to make a for loop in bash with 0.02 as increments I tried for ((i=4.00;i<5.42;i+=0.02)) do commands done but it didn't work. I appreciate if you help me out.
2
votes
0answers
53 views

Why does this pipe not end when the las process dies (zombie)?

I have a script run and monitored by svscan/supervise. When the last luces-hf/run: #!/bin/bash set -v export http_proxy=[redacted] curl -N -s https://[redacted] |\ grep --line-buffered "event" | ...
-1
votes
0answers
42 views

How can I make a Linux system output a bell sound when no packet is received before the next packet is transmitted with the ping command?

This is easy enough on OS X. I just use ping -A example.com and it works just fine. (Note the capital "A".) But it doesn't work like that on Linux. On Linux, the manual page reads as follows: ...
0
votes
1answer
14 views

How to create a module on a CentOS cluster [on hold]

I would like to create a module on a CentOS 6 cluster (e.g. module load gcc-4.7.2). Basically, I have no clue how modules work. Are there any good tutorials illustrating this or could someone ...
0
votes
0answers
27 views

shell script in doing operation for 2 folder tree [duplicate]

I have a directory looks like: dhcp-18-189-47-44:CE-06-new-stuctures_backup wenxuanhuang$ ls DFT-00001 DFT-00004 DFT-00007 DFT-00010 DFT-00013 DFT-00016 DFT-00019 DFT-00022 DFT-00025 DFT-00028 ...
1
vote
3answers
37 views

Read cells in csv file

I have this table of numbers saved in csv file format as follow: 5, 6, 9, 5, 2, 8, 1, 1, 1, 2, 3, 6, . . . . . . . . . . . . . . . . . . . . Every row in this table describe a ...
0
votes
1answer
26 views

extract subfolders outside and rename if necessary

I have a directory looks like: dhcp-18-189-47-44:CE-06-new-stuctures_backup wenxuanhuang$ ls DFT-00001 DFT-00004 DFT-00007 DFT-00010 DFT-00013 DFT-00016 DFT-00019 DFT-00022 DFT-00025 DFT-00028 ...
1
vote
1answer
44 views

Can't redirect cut output

When I try to redirect the output of cut it always seems to be empty. If don't redirect it, the output shows in terminal as expected. This is true for OS X 10.10 and Linux 4.1.6. This works: ...
5
votes
1answer
134 views

How to have type-ahead apply to bash history search (Ctrl-R)?

Context Typeahead in bash: good When a bash shell is busy (initializing, running a command), one can type before the next prompt appears. If the shell has launched a program, that program will ...
2
votes
3answers
33 views

Different 'time's called in similar environments in bash

I was told that people using bash will have to differentiate between the shell-builtin time and /usr/bin/time ( time(1) ). I had to time a program and also had to find ways to automate input, using ...
0
votes
1answer
39 views

Parsing a file to determine what values to use [duplicate]

I have a script and a "config" file that pull variables from. I created the configuration file called config.cfg and used it in my script as such: #! /bin/bash if [ -f ./config.cfg ] then ...
1
vote
4answers
94 views

Show ratio for all availiable resolutions

I tried to get the ratio with this script: echo "$(xrandr)"|cut -f 4 -d" "|sed 's/x/00 \\\* /g'|while read i; do echo "$i = "$(expr $i); done but I get errors like 102400 * 768 = expr: ...
0
votes
0answers
37 views

Passing variables through <<EOF [closed]

fdisk /dev/$ROOTDISK <<PARTCMD d $ROOTPARTNUM n p $ROOTPARTNUM PARTCMD How can i pass the $ROOTPARTNUM variable?
0
votes
1answer
58 views

How can I merge 3 commands and execute them

I'm try to run a script that figures out the paths based on the hostname: e.g. if hostname returns computer1 I would like to run path/to/Computer1.py (where path/to is a path that will always be the ...
4
votes
1answer
30 views

How do I abort fc without executing the command?

The command fc will allow visual editing of the previous command. If I change my mind in the editor, how do I stop the command from being executed. In vim, typing q! or q both result in the command ...
0
votes
0answers
17 views

Environment Variable not Exporting [duplicate]

I have this script that I'm writing, basically as my own free dynamic dns system (with a bit more manual-ness at the moment). Here it is: #!/bin/bash ...
0
votes
1answer
26 views

sort process by cpu usage in cygwin

please help me to sort process by cpu usage in cygwin. I already tried tasklist but it shows only process by memory usage .
3
votes
2answers
45 views

process Count of each user in ps aux command

How can i create a script to count process run by each user in ps aux. I used this ps aux | awk '{print $1}' | grep root | wc -l but it lists count of root user only . I want to list number of ...
1
vote
1answer
28 views

Can I uncompress a zip file containing a disk image and then save that to an SD card all in one step?

I am under the following restrictions: I have a 1.0 GB .zip file on my computer which contains one file, a disk image of raspbian. When uncompressed, this file is 3.2 GB large and named ...
1
vote
0answers
22 views

Why does history not overwrite but append when histappend is set to off in Bash?

Several days ago, I had one Terminal tab doing ssh, and the other doing a lot of work locally. And then I restarted the machine (on a Mac with Mavericks). When I ran Terminal again, I found that all ...
20
votes
3answers
512 views

What does 'exec {fd}</dev/watchdog' do in Bash

That is literal, {fd} isnt a placeholder. I have a script that does this, and does not source in anything, nor does it reference {fd} anywhere else. Is this valid bash? exec {fd}</dev/watchdog
2
votes
5answers
288 views

Get very next word of a substring in a string

I need to get the next word of a word in a string. I tried to write a script but it's not working. And it's good if you suggest me any other alternatives to achieve this. Script: #!/bin/bash ...
1
vote
3answers
35 views

Select and sort IP address keeping the whole line

So I need to sort the IP Addresses and then sort my line by them. I can sort IP addres in a file by using : sort -n -t . -k1,1 -k2,2 -k 3,3 -k4,4 If my file looks like : add method1 a.b.c.d ...
0
votes
2answers
37 views

Different behaviour of eval “ command \”$@\“ ”, “$@”, and “$(echo $@)” when used as arguments [duplicate]

I would like to pass multiple arguments to the Tor browser (firefox) programatically through a function arbitrarily entitled tor. This is so as to command tor search terms and voila! My search terms. ...
-3
votes
1answer
44 views

How can i replace a specific string within a line inside a text file [duplicate]

$ cat text.txt my name is Steven my age is 10 i like dogs What command will be fitting so that echo "Kate" will replace Steven on text.txt?