Bash is a free shell for Unix-like operating systems from the GNU Project.

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Allow permission to custom bash command without allowing permission to underlying command

We have an automatic script on one of our servers, run by observing-user. It needs to tell another script, run by primary-user, to update a log file. The code for this is sudo kill -UPDATE_LOG pid ...
2
votes
2answers
1k views

OS X Terminal wildcard doesn't work for some paths

Okay, this is weird, hopefully someone here can explain what is happening. I am using OS X 10.9.4 and I want to list files in a directory (and filter them using *) I want to look for zip files in ...
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1answer
120 views

How can I move a specific folder if there is a file with the same name in bash script?

I'm trying to write a shell script that finds a specific file and moves it to a folder. #!/bin/sh echo -n "/home/cosmoretro/movie/" read text2 while : do echo -n "Ara:" ...
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1answer
489 views

insert complex line in html file from the command line/bash script

I use a bash script to add a javascript file to a directory, but after that I need to insert into the index.html this line at between line 30 and 31. <script type="text/javascript\" src="./js/...
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2answers
577 views

Renaming files from a list of filenames

I'm still very new to shell scripting so I'm sure this command is all kinds of wrong. I am trying to rename a folder of files to the names in a txt file. The precondition is that the filenames.txt and ...
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1answer
118 views

Print Windows mapping of root path in MSYS Bash

In MSYS Bash I get: $ cd ~ $ pwd /c/Users/antonio but: $ cd / $ pwd / Can I get the full Windows absolute path from Bash?
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1answer
58 views

Script won't loop through files like planned

I got this script that loops through log files, but I changed something and it doesn't work: #!/bin/sh n= while true do fname="trace$n.log" [ -f "$fname" ] || break n=$(($n+1)) done ...
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1answer
48 views

Find 350ms in traceroute logs?

So I have a bash script that creates logs like this: traceroute to -------, 30 hops max, 60 byte packets 1 router.Belkin (192.168.2.1) 2.275 ms 2.263 ms 2.249 ms 2 ------- 16.961 ms 21.060 ms ...
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2answers
333 views

Is there a way to create a command line wrapper for a bash file?

The title says it all. I would like to type "run" in the command line and it would execute /pathtoscript/script.sh. Thank you!
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2answers
652 views

How to make a bash script wait and then continue running?

I have an .sh script. I would like to wait 25 minutes and then continue running, NOT repeat. It's something like this: #!/bin/bash /bin/bash ~/path/script.sh I want it to kill a process after ...
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1answer
157 views

pass arguments to alias then disown

I am trying to create a simple alias: alias draw="pinta &> /dev/null & disown" The intent here is pretty obvious. My problem is that whenever I pass an argument, I get bash: disown: ...
2
votes
1answer
169 views

How to make a bash write to trace.log, trace1.log, etc.?

I am making a script and would like to write it to another file if that one exists? traceroute google.com > trace.log Any help would be appreciated. Also, i am a newbie, so an example would be ...
2
votes
1answer
102 views

PATH preference in bashrc

I was wondering what happens in the following situation. Suppose I have an executable file in a directory that is in PATH in .bashrc. If I copy the file into another directory that is set in PATH also,...
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votes
1answer
420 views

How to fg a process suspended before starting tmux inside the new tmux session?

How to 1. suspend a process with ^Z, 2. start tmux and 3. fg (or bg) the suspended process? $ find / [.....] ^Z [1]+ Stopped sleep 10 $ tmux $ fg -bash: fg: current: no such job ...
1
vote
1answer
564 views

Run sed as a one-off ssh command

I would like to substitute a string with another in a file on a server of mine. I've tried doing this: ssh $REMOTE_HOST sed 's|export ${KEY}=${VAL}|export ${KEY}=${NEW_VAL}|' "$ENV_FILE" And a ...
2
votes
1answer
79 views

Using bash script to select/view only specific data from logfile

My NAS creates a logfile in the format below: <30>1 2014-07-21T05:02:10+02:00 ABC-NAS qlogd 6432 - - qlogd[6432]: event log: Users: Glacier, Source IP: 127.0.0.1, Computer name: localhost, ...
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1answer
340 views

How to port my current bash history over when opening a tmux session?

I often find myself in this situation: I start doing something in a terminal. I need more terminal space, so I open tmux. History is gone, even the commands I wanted to run inside tmux. How can I ...
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1answer
235 views

How to run a random command every time I start a terminal [closed]

I have a doubt about script.I need to execute some random command when i open terminal its automatically execute that command. For Example, if i open first terminal the terminal will execute ls ...
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0answers
115 views

Command 'at' does not work in one Synology NAS, though it works perfectly on another

I have installed at command on 2 different NAS synology. On 1, it works perfectly, on the other I get the message: Villars1> echo "touch /tmp/tt" | at now next minute warning: commands will be ...
0
votes
1answer
91 views

What does if [-f file]; mean?

I have an if statement in a bash file: if [ -f bin/post_compile ]; then echo "-----> Running post-compile hook" chmod +x bin/post_compile sub-env bin/post_compile fi what does the -f ...
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2answers
248 views

Crazy terminal behavior

I am trying to run a script to rip all the audio from a bunch of MP4 files. Everything works when I do it line by line cutting and pasting from my text editor into terminal, but when I create a shell ...
2
votes
2answers
357 views

Why does this gpg command in a script behave differently when it's pasted into a shell?

Here is a script which symmetrically encrypts/decrypts a file with two different symmetric ciphers in sequence. #!/bin/bash if [ "$#" -ne 2 ]; then echo "Arguments: enc|dec filename" exit fi ...
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0answers
133 views

Entered wrong .bash_profile and now my laptop is running hot

I am just learning how to use the command line and was editing the bash prompt setting in .bash_profile. I made an error in the prompt settings in .bash_profile and I lost the prompt and the ability ...
4
votes
1answer
413 views

Hook into “command not found” handler in Ubuntu

I want to hook into the handler for command not found wim@SDFA100461C:~$ thing No command 'thing' found, did you mean: Command 'tping' from package 'lam-runtime' (universe) Command 'thin' from ...
3
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3answers
156 views

Sed replace only in even numbered lines of a file when replace commands are written in a file

I have all the replace commands in a file (say replace.sed) and i use it with -f flag of sed (sed -f replace.sed InputFile). But now i ran into a condition where i need to apply these replace rules ...
2
votes
1answer
3k views

wc / cat command not found

I'm trying to run some simple bash script which uses wc and cat commands. The script fails with this: wc: command not found or this (after I commented string which uses wc): cat: command not found ...
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votes
2answers
1k views

PuTTY remote command containing while loop

I am attempting to automate several common tasks that I SSH into a remote server to do. For this, I am using PuTTY and its "remote command" option (Connection > SSH) in several saved sessions. My ...
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1answer
497 views

tar -czvf with no output file

Say you run tar -czvf some_folder_here and don't actually specify an output file, like tar -czvf some_output_file.tar some_folder_here. Where does the file go? I just ran this by accident, and the ...
0
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1answer
620 views

grep: Invalid back reference for date expression in tcsh

I googled for the following error, and didn't get any great explanations as to what was going on with grep under tcsh. (Yes, that date expression exists in the log files). $ grep '2014-07-21' *.log ...
0
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2answers
56 views

How to execute files which are found by find

I have some executable files under a directory tree. I want to find them and execute them the most simple way. I've tried this so far: find . -perm 0775 -type f | xargs exec But exec is not an ...
2
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1answer
596 views

Tried Installing ZSH through cygwin and then trying to use zsh through Cmder

I tried to install Cygwin (64 bit version) on my computer, and it went through hunky-dory until at the very end, autorebase.bat failed with exit code 1. I read through the logs and they weren't too ...
0
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1answer
92 views

psql ignores my PAGER variable

I want to use less as my default pager. Therefore I have PAGER=less in my .bashrc. It's sourced properly: $ echo $PAGER less However, psql still uses more if I call it with psql. BUT: If I call it ...
1
vote
4answers
187 views

How to rename a lot of files in bash shell?

Sorry for the question. I searched the internet a lot, but couldn't find an answer which worked (though there were a lot of suggestions). So, I want to rename A LOT of files. Writing all file names ...
0
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1answer
129 views

stop all child processes when 1 of then returned exit code 1

I have 2 or more build processes to run in background. I want to stop all the build processes if one of them exit with code other than 0. ./build-1.sh & ./build-2.sh & ./build-3.sh & wait ...
0
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1answer
209 views

Bash prompt command being overwritten when invoking history/deleting command

My Bash prompt clears itself when deleting the text after it or going too far in the history. When logging in, the prompt looks normal. There are white brackets around a colored username and then a ...
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0answers
20 views

Access script arguments from within script [duplicate]

I have a script that I can run like this: bash myscript.sh -ram 4096M -jar something.jar -dir /home/something I would like to be able to access the variable ram, jar, and dir from within the script. ...
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2answers
50 views

Retrieve secure copy in UNIX?

Is there a way to retrieve a secure copy in UNIX? Why would I need to do this? Because I can login to a remote machine from my local machine, but not the other way around. So I need to retrieve a ...
0
votes
1answer
116 views

Command fails in a script? [closed]

I'm trying to script the OpenSSL ec command. The script is used to validate a collection of keys produced by another library. The script is shown below after the question. The following works from a ...
0
votes
1answer
114 views

CentOS 6 - Send user defined command from PHP

I have a web control panel and I need my allow my users to send commands to their application. I a similar problem to SQL injection. $user_input='good command'; shell_exec('tmux send-keys session1:0 ...
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votes
1answer
53 views

how to retrieve following error when i execute shell script

I have one script to log into remote server.But i tried to Execute the script some error occur. Logs: My script: #!/bin/bash S1=$(ssh -t selvam-odc-shell1 "users | wc -w ") S2=$(ssh -t selvam-odc-...
2
votes
2answers
2k views

How to download an image with wget and save it with the md5 hash as name?

How can I make a download an image, md5 hash the image, and save that image with the md5 hash as name to a directory using wget? # An example of the image link... http://31.media.tumblr.com/...
2
votes
1answer
1k views

ipython notebook can't find python

I had a couple of Python 2 versions under home-brew. Since I was only using ipython notebook, I decided to uninstall all Python 2 instances, which turned out to be a bad idea because now I just get an ...
1
vote
1answer
2k views

Batch convert txt file encoding

I have about 700 files that were the results of a closed caption software process. I can open the files on my PC or Mac in a GUI, but when I open it on the server with nano, I get this: ��0^@0^@;^...
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2answers
656 views

Can bash wildcards specify negative matches?

In bash is it possible to use wildcards to specify "all files in current directory EXCEPT [files matching a specific (wildcard) pattern]"? Eg, "all files which don't match *~" Or more generally, is ...
1
vote
1answer
341 views

Is it possible to open a port for listening without netcat?

I have a need for a Linux system to listen on a TCP port and dump what it receives to a file and/or stdout. The system does not have netcat installed. I have root permissions, but am not allowed to ...
1
vote
0answers
124 views

curl won't shut up (--silent does nothing)

I'm writing a quick shell script, and I cannot for the life of me get curl to suppress the progress bar. The relevant line looks like this: curl http://website -o $temp >/dev/null 2>&1 ...
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0answers
111 views

popd and pushd behavior with “-n” option

I've been experimenting with pushd and popd in bash (Cygwin, man page says "GNU bash 4.1") and the man page doesn't quite seem to match the behavior. For pushd, the command % pushd +1 both ...
1
vote
1answer
46 views

Different globbing behavior with same shopts?

I have multiple shells (bash) open on the same machine, and in one of them, globbing seems to have stopped. ls * gives ls: *: No such file or directory, and so on. I figured that I must have set some ...
0
votes
3answers
663 views

Redirect stdin to stdout

I've got a script, ex myscript.sh, and it has to redirect to stdout what it gets from stdin (like a cat). For example: myscript.sh < myfile.txt > myfile2.txt How to do this? Also, how can i ...
0
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1answer
400 views

crontab and binaries in /usr/local/bin

I am working in Redhat and have few programs located in folder /usr/local/bin I would like to call from crontab for root user. I thought that by putting binaries in that folder would be sufficient to ...