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15
votes
3answers
1k views

head eats extra characters

The following shell command was expected to print only odd lines of the input stream: echo -e "aaa\nbbb\nccc\nddd\n" | (while true; do head -n 1; head -n 1 >/dev/null; done) But instead it just ...
44
votes
8answers
4k views

Why are POSIX mandatory utilities not built into the shell?

The purpose of this question is to answer a curiosity, not to solve a particular computing problem. The question is: Why are POSIX mandatory utilities not commonly built into shell implementations? ...
5
votes
1answer
579 views

Tool to automatically extract sub-images that are inside an image: sub-images separated by whitespace

Is there a tool/script which can extract images (save them as separate image files) inside an image, each sub-image is separated by whitespace? This: Would result in 3x: Image Source
2
votes
8answers
1k views

Is there a shell command or utility for caching process output?

Hope this is the right place to ask. Is there a unix tool that works similarly to this? # invokes echo, saves to cache (using command with arguments as key), returns "hi" cache 10 echo hi # wait 2 ...
2
votes
2answers
828 views

Sorting and Grouping Domains and Subdomains

Is there a better way of sorting and grouping domains and subdomains together? For e.g., the file list containing morefu.sub1.foo.com www.foo.com bar.foo.com sub1.foo.com fufu.isub1.foo.com foofoo....
0
votes
2answers
616 views

How to use sqlformat tool with pgAdmin

I am trying to add external SQL formatting utility to pgAdmin. There is an option available in pgAdmin3 in Preferences -> Query tool -> Query editor called external formatting utility I set up ...
0
votes
2answers
86 views

Tool for managing local development repositories [closed]

I'm a web developer and I work with various languages and projects (who doesn't?). I've cloned many of these projects/repositories locally to various directories. Now, with dozens of projects cloned ...
3
votes
2answers
2k views

Check files for conventions

I need a script that checks and lists all text files for project conventions. With conventions I mean for example: UTF-8 encoding No trailing white spaces Newline at the end of file No not-ascii ...
4
votes
1answer
17k views

Ubuntu runuser command?

I am creating a bash script that requires to run commands as a specific user. As a result I am using the command: runuser I have tested this script and it works perfectly in Ubuntu Server 14.10. ...
2
votes
1answer
529 views

Is there a text-only equivalent (no curses) of `zenity --question`?

For my mercurial commit hook, I want to run my test cases and be asked whether I really want to commit if any of the tests fail. I'm thinking something like <run-the-tests> || <ask-yes-no>...
1
vote
1answer
599 views

Is expect tool availabe for ARM platform

I need to get expect (tool for automating interactive applications) for the ARM platform. Is it a readily cross compiled to ARM and is it available? I tried googling but was unable to get the ...
70
votes
4answers
26k views

Fix or alternative for mktemp in OS X

I'm looking at a bash script someone else wrote that uses mktemp: TEMP=`mktemp --directory` However, this line does not work on my machine (OS X 10.6). How would I fix this line so that it is cross-...
4
votes
2answers
4k views

Set alignment of numeric columns when columnating data

I use column -t to format data for easy viewing in the shell, but there seems to be no option to specify column alignment (e.g. align to the right). Any Bash one-liners to do it? I have arbitrary ...
3
votes
1answer
2k views

How synchronize two disks (or folders) using symbolic (or hard) links (like rsync)?

I'm searching a tool or a shell script or another program to synchronize two or more folders or disks. But it differs of rsync tool, because, I don't want to duplicate the missing file, but do a ...
3
votes
2answers
112 views

Unatended script execution in ubuntu terminal

I have installed Ubuntu on a VMWare virtual machine. When I got to installing a VMWare tools, I have stumbled upon a simple question: If I execute a script (perl script in VMWare tools case), is ...
5
votes
1answer
173 views

How would one detect if external command exists in a script?

Is there a way to detect if an external command exists (i.e. wget, svn)? More specifically today, i was trying to run one of my scripts i wrote and the person didn't have wget or svn installed. The ...