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1500 questions
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5 answers

Merge two video clips into one, placing them next to each other

I have two video clips. Both are 640x480 and last 10 minutes. One contains background audio, the other one a singing actor. I would like to create a single 10 minute video clip measuring 1280x480 (in other words, I want to place the videos next to…
user
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84
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4 answers

How to change systemd service timeout value?

In the company I am working now there is a legacy service and its init script is using old SysvInit, but is running over systemd (CentOS 7). Because there's a lot of computation, this service takes around 70 seconds to finish. I didn't configure…
Caesar Ralf
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84
votes
2 answers

Grep 'OR' regex problem

I am trying to use grep with a regex to find lines in a file that match 1 of 2 possible strings. Here is my grep: $ grep "^ID.*(ETS|FBS)" my_file.txt The above grep returns no results. However if I execute either: $ grep "^ID.*ETS" my_file.txt …
dr.bunsen
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84
votes
2 answers

Can I get individual man pages for the bash builtin commands?

Is there anywhere you can download a manpage for every builtin commands? I know you can just use help or man bash and search to find info about it, but I want them separated, so I can just do man read and get the read manpage.
Tyilo
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84
votes
7 answers

Determining if a file is a hard link or symbolic link?

I'm creating a shell script that would take a filename/path to a file and determine if the file is a symbolic link or a hard link. The only thing is, I don't know how to see if they are a hard link. I created 2 files, one a hard link and one a…
k-Rocker
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84
votes
15 answers

What are the legitimate uses of the `touch` command?

What's the point of the touch command? I know I can create empty files with it, but so is also the case with echo -n. Otherwise, why would someone need to change the timestamps of a file? Unless to create the false impression about the age of a…
Quora Feans
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83
votes
10 answers

Disable screen blanking on text console

I'm running linux clusters, mostly on SLES10. The servers are mostly blades, accessed via remote console. There is a real console in the server room, but switched off. I would like to disable the screen blanking as it serves no purpose and is…
markus_b
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83
votes
6 answers

Which file compression software for Linux offers the highest size reduction for source code?

I do a ton of file compression. Most of the stuff I am compressing is just code, so I need to use lossless compression. I wondered if there was anything that offers a better size reduction than 7zip. It doesn't matter how long it takes to compress…
Zach
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83
votes
3 answers

How do I start a Cron job 1 min after @reboot?

I need my script to be executed a minute after each reboot. When I apply @reboot in my crontab it is too early for my script - I want the script to be executed after all other tasks that are routinely run on reboot. How might I run the script…
Yurij73
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83
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2 answers

Why does '/' have an '..' entry?

This has always puzzled me. Why does the root directory contain a reference to a parent directory? bob@bob:/$ ls -a . build home lib32 mnt .rpmdb sys vmlinuz .. cdrom initrd.img lib64 opt sbin tmp …
Nathan Osman
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83
votes
2 answers

Clear / erase a mistyped invisible password on a shell / terminal in Linux

One thing that annoys me using Linux's terminal is when I have to type a invisble password, like when you run ssh. Sometimes I mistype one or more letters and then I have to press backspace key a few times to make sure that I erased everything to…
StackUnder
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83
votes
15 answers

How to grep a specific line _and_ the first line of a file?

Assuming a simple grep such as: $ psa aux | grep someApp 1000 11634 51.2 0.1 32824 9112 pts/1 SN+ 13:24 7:49 someApp This provides much information, but as the first line of the ps command is missing there is no context for the info. I…
dotancohen
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83
votes
3 answers

Tmux, change window pane by mouse click

Is it possible to use the mouse to navigate between different window panes which are split vertically or horizontally?
daisy
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83
votes
7 answers

how to redirect output to multiple log files

How to redirect standard output to multiple log files? The following does not work: some_command 1> output_log_1 output_log_2 2>&1
doubledecker
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83
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4 answers

What is the purpose of -e in sed command?

I can't find any documentation about the sed -e switch, for simple replace, do I need it? e.g. sed 's/foo/bar/' VS sed -e 's/foo/bar/'
Howard
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