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
1answer
12 views

Execute bash snippets directly in shell?

Is there any way to execute small bash snippets in the shell? If you don't want to edit a file again and again and test it by executing it again and again (in fact by jumping forth and back between ...
1
vote
1answer
10 views

bash command/script to reset default route

I manage several OpenWrt (embedded linux) routers for which I've written bash scripts to run an Openconnect VPN client. The client uses "vpnc-script" to set up routing, which replaces the initial ...
0
votes
3answers
630 views

Split XML file into multiple files

I have an xml file that have different nodes, I want to split files like this: <unix> <mm> </unix> <osx> <nn> </osx> When I run the script I want it to make ...
2
votes
1answer
31 views

Source .bashrc in zsh without printing any output

In the past, I've used bash consistently, because it's everywhere. But recently I started to try zsh. I don't want to give up updating my .bashrc fil which is rsync'ed to all my servers . So, in my ...
0
votes
2answers
40 views

expect: does “” (spawn_id exp70) match glob pattern

I have written an expect script that works perfect for testing passwords on our network until it has looped through my list quite a bit, then the debug output shows that there is nothing to match. ...
1
vote
2answers
1k views

Use sudo tee with heredoc to append to existing file

From Generate script in bash and save it to location requiring sudo we have this method, which I like: sudo tee "$OUTFILE" > /dev/null <<'EOF' foo bar EOF However, I would like to use that ...
5
votes
3answers
221 views

Exiting a shell script with nested loops

I have a shell script with nested loops and just found out that "exit" doesn't really exit the script, but only the current loop. Is there another way to completely exit the script on a certain error ...
28
votes
7answers
40k views

Execute a command once per line of piped input?

I want to run a java command once for every match of ls | grep pattern -. In this case, I think I could do find pattern -exec java MyProg '{}' \; but I'm curious about the general case - is there an ...
3
votes
2answers
48 views

How do I filter stdout of a program through grep while still controlling the program?

I'm trying to filter the output of the mpv media player, removing a particular line, but when I do so I am unable to control mpv with the keyboard. Here is the command: mpv FILE | grep -v 'Error ...
17
votes
2answers
19k views

“su” with error “X11 connection rejected because of wrong authentication.”

As root, I'm connecting to a remote host to execute a command. Only "standarduser" has the appropriate id-file and correct .ssh/config, so I'm switching the user first: su standarduser -c 'ssh -x ...
1
vote
2answers
28 views

how to use nohup while still sending stderr to the terminal

nohup automatically redirects stderr to stdout, but I want to send it to the terminal (it shows progress). How can I do that?
3
votes
2answers
521 views

Creating an alias to Change Directory and have that directory be the current working directory in new terminal tabs

I'm trying to create a convenience alias that will change directories and then start a node server in that directory. I have it working for the most part, there's just one little issue that I can't ...
4
votes
1answer
113 views

How does Bash auto completion work?

I can understand that bash auto completion works for standard utilities. But how does it do auto completion for custom programs like Oracle SQL loader? In the following command if you Tab after ...
-1
votes
1answer
39 views

To sed if with and without conditions correct

I know that I may have the C package #include <stdint.h> in the first 1-30 lines. I would like to add it to lines where no previously if the file contains the word LARGE_INTEGER by GNU tools. ...
1
vote
2answers
52 views

Bash - incremental history search (ctrl+r) - matching multiple non-adjacent words

When using Ctrl+R to search bash history, is there some way to match two words that aren't next to each other. For example, let's say I wanted to find the last command that contained httpd and awk ...
3
votes
4answers
23k views

Yum update problems on CentOS 6.5 minimal as VMware guest

INFO: I am using Windows 7 Pro (64bit) with VMware Workstation version 10.0.1 . I am using CentOS(64bit) 6.5 minimal, for the first time. I am running this from my workplace network, which may use a ...
0
votes
0answers
15 views

Jumpimg between similar directories [duplicate]

My source and build directory structures are almost identical- /data/fs/src/lib/dedup/ /data/build/src/lib/dedup/ And I frequently navigate between them. It's painful to traverse up the parent ...
1
vote
1answer
52 views

How to get last N commands from history?

I want to see what are the last N commands in my history. I thought history | tail -n 5 would make it, but I noticed that a multiline command counts for as many lines as it has. $ echo "hello how are ...
1
vote
2answers
59 views

How do I get the output of a program already running?

I have a python program that outputs to stdout and a log file. However, the person I am making this for wants to know if I can set it up so that he can see the output of the file, while it is ...
1
vote
3answers
193 views

Put big data of heterogenous byte offset into arrays by AWK

Assume the data consists of byte offset which is not fixed i.e. the distance of two subsequent file headers varies. The point of this thread is to go through each size of events separately in arrays. ...
13
votes
3answers
423 views

Unexpected Bash completion of ~ on OS X

I pressed ~TabTab on the bash command prompt and got an unexpected set of completions. First it looked like all the folks in the /Users directory, and a lot more. Then I thought it was doing the ...
2
votes
1answer
63 views

Convert IP Address to Coordinates using database

I have a file which contains IP and I wanted to compare it to Coordinates using a local database (instead of API). I tried following a process and break down to pieces and created scripts referring ...
0
votes
1answer
25 views

Export mysql to remote server using one SSH session

I've come across a situation where I had to create a utilitary shell script that would be executed in many servers from different regions. The objective is to dump the local mysql database, copy it to ...
-3
votes
0answers
32 views

Detecting the newest file in a directory [on hold]

I need a Unix script to do the following (in bash) : Accept 1 parameter; (the parameter can only be bo or bot.) Change directory (at this time, this can be determined yourself for now); Detect the ...
0
votes
3answers
46 views

Bash: increment a variable in a while loop?

Bash newbie here! I have a bash script that for each file in a set, greps each line in the file for a string. Then it splits the line on commas, converts the 7th element to a float, and increments a ...
2
votes
1answer
141 views

“Debugging” with bashdb: why do I lose command echo after stepping into a simple script?

I heard about the bash debugger ( bashdb ) after reading a comment so I thought I should try it out and see if it can help me analyze bash scripts or more generally the execution of commands. There ...
0
votes
0answers
18 views

Why is Debian's PS1 variable different from the other distros? [duplicate]

I've noticed that Debian's PS1 variable is a little different. For example: root@debian:~# echo $PS1 ${debian_chroot:+($debian_chroot)}\u@\h:\w\$ What is this part: ...
0
votes
2answers
44 views

How do I create a user bin directory in gentoo

I would like gentoo to allow users to have a bin directory which is added to the PATH variable for that user. The directory would be located at /home/user/bin. Where is the best place to set the PATH ...
3
votes
1answer
615 views

KSH styling text based menu using STDERR

Is it possible to format the STDERR in order to have a better looking menu using the select command? I have a simple select select oChoice in $(<tempMenu.menu) ; do case "$oChoice" in ...
-1
votes
1answer
83 views

mv command does not work in shell script [closed]

I want to rename a folder with a bash-script. I don't know why this command is not working in a shell script, but directly in the terminal is working without problems. ...some code... ...
4
votes
0answers
41 views

How can I make tmux tell bash to display the *logical* version of the current directory in newly opened windows?

Background I'm using tmux 2.0, Ubuntu 14.04.2 LTS in VirtualBox. In my ~/.tmux.conf file I have the line: bind c new-window -c "#{pane_current_path}" to make tmux open new windows with the same ...
0
votes
1answer
30 views

Linux: Test if in maintenance mode?

I want to run some things differently if I have booted into single-user/maintenance mode. I want to know how I can test in my .bashrc, in particular I would like to start tmux only in that mode, to ...
2
votes
5answers
483 views

How to edit/delete a .dot_file on mac without using Terminal

When I start Terminal I can not control it. It starts executing an endless loop repeating that some alias does not exist. Because of this I am not able to edit this file using a program such as vim. ...
11
votes
1answer
111 views

Update bash history on others terminals on exit of one

I know this question has a similar interpretation, as its asked here keep updating (and duplicated here). But what I'm trying to achieve is a bit different. I don't like the idea of my prompt ...
53
votes
2answers
1k views

Security implications of forgetting to quote a variable in bash/POSIX shells

If you've been following unix.stackexchange.com for a while, you should hopefully know by now that leaving a variable unquoted in list context (as in echo $var) in Bourne/POSIX shells (zsh being the ...
2
votes
1answer
170 views

variable name lost when tab completing to export an environment variable with a path

I'm trying to setup an environment variable using tab completion, e.g. snowch$ export JAVA_HOME=/usr/lib/jvm/java-6-oracle/ I used to be able to tab complete the folders after typing the export ...
0
votes
1answer
57 views

route -n gives output “route: fscanf”

If I boot my system and no interface has an IP address I get the above output. However if I give an interface an IP, even if I remove it again, this will disappear. Why does this happen? Is it that ...
1
vote
1answer
59 views

Ctrl-Y, emacs styled yank text is not working when user is switched

I cut the bash command line text using Ctrl-K. The line got cut. Now, I ran sudo su to become the root user. I tried to paste the command that i cut as non-sudo user using Ctrl-Y. It is no longer ...
8
votes
4answers
2k views

How does Bash path completion work with sudo?

Tab path completion does not work (at least on Ubuntu and AFAIK Arch) with sudo mount <whatever> The iso file I am trying to mount is not in /etc/fstab. If I just type mount <whatever> ...
1
vote
2answers
132 views

bash completion in Posix mode

I would like to use an interactive Posix bash shell but the autocomplete feature doesn't work. When I type the Tab character it simply prints a tab. The tab completion works only when I'm in a ...
5
votes
3answers
520 views

bash does not autocomplete my command when using sudo?

I'm using SaltStack. I would like to auto-complete the minion name when calling the salt command. The following line has been added into ~/.bashrc: complete -o default -o nospace -W "$(sudo ls -1 ...
16
votes
4answers
13k views

Solving “mv: Argument list too long”?

I have a folder with more than a million files that needs sorting, but I cant really do anything because mv outputs this message all the time -bash: /bin/mv: Argument list too long I'm using this ...
1
vote
1answer
37 views

CasperJS and PHP In Cron Job Cannot Open Files, Works Fine When Run Manualy

I recently got a new DigitalOcean LEMP environment with Ubuntu. I tried making an SH script that uses CasperJS to scrape data from an external website to a JSON file, and a PHP script to parse the ...
0
votes
1answer
18 views

Substituting the value with spaces for a variable in bash script - the correct way

I have a compilation script that can compile the program with and without the debug symbols. I want to ask via bash prompt ( read ) the user to choose whether he wants a debug version or not with ...
69
votes
10answers
72k views

How to add a newline to the end of a file?

Using version control systems I get annoyed at the noise when the diff says No newline at end of file. So I was wondering: How to add a newline at the end of a file to get rid off those messages?
1
vote
1answer
43 views

Syntax error at a semicolon in a shell script

The one liner command will be longer but this is the part that is throwing the error. for user in natural1 ; do cat <<EOT >> /home/$user/public_html/.htaccess <FilesMatch ...
0
votes
1answer
46 views

Issue a command in each directory

I have 3 directories: dir1 contains two subdirs. In every subdir there is a slackbuild. I want to build all slackbuilds, staying in the parent directory. I have tried (cd *;sh *ld) But it only ...
10
votes
4answers
1k views

How do I trigger autocomplete without a tab key?

I'm ssh-ing to my machine using my iPhone with an app called ServerAuditior. It doesn't have tab key. See screenshot. How do I trigger autocomplete without the tab key? I don't want to type a lot of ...
4
votes
3answers
85 views

-bash: unalias: ls: not found

I am trying to install tomcat 8 on centos 7. I am using the terminal as root. When I type in source ~/.bashrc, the terminal gives back the following error: -bash: unalias: ls: not found. How can ...
1
vote
1answer
27 views

bash: Passing several space containing filenames

In a bash script I am rasterizing a PDF page by page into single files, in the end the single resulting PNGs are merged again into a PDF like this: convert -monitor /path/to/1.png /path/to/2.png ...