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1500 questions
121
votes
9 answers

Creating a GIF animation from PNG files

Is there a tool to create a gif animation from a set of png files? I tried the convert command from the ImageMagick suite, but this doesn't always succeed. Also, I have several issues with this: I can't tell what the progress is. No matter what I…
Yotam
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121
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4 answers

How can I make a script in /etc/init.d start at boot?

I think I read something a while back about this, but I can't remember how it's done. Essentially, I have a service in /etc/init.d which I'd like to start automatically at boot time. I remember it has something to do with symlinking the script…
Naftuli Kay
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121
votes
10 answers

Set the default kernel in GRUB

How can I pick which kernel GRUB 2 should load by default? I recently installed a Linux real-time kernel and now it loads by default. I'd like to load the regular one by default. So far I only managed to pick the default OS... and for some reason…
TomTom
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121
votes
7 answers

Convert file contents to lower case

I have temp file with some lower-case and upper-case contents. Input Contents of my temp file: hi Jigar GANDHI jiga I want to convert all upper to lower. Command I tried the following command: sed -e "s/[A-Z]/[a-z]/g" temp but got wrong…
JigarGandhi
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121
votes
10 answers

How to check which GPU is active in Linux?

I have 2 GPU's in my netbook. How do I know which one I'm actually using at any given moment?
LanceBaynes
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121
votes
5 answers

Exclude one pattern from glob match

I have several files with the same base filename. I'd like to remove all but one foo.org #keep foo.tex #delete foo.fls #delete foo.bib #delete etc If I didn't need to keep one, I know I could use rm foo.*. TLDP demonstrates ^ to negate a match.…
jake
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121
votes
12 answers

Generate random numbers in specific range

After googling a bit I couldn't find a simple way to use a shell command to generate a random decimal integer number included in a specific range, that is between a minimum and a maximum. I read about /dev/random, /dev/urandom and $RANDOM, but none…
BowPark
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120
votes
13 answers

How to test what shell I am using in a terminal?

How to check what shell I am using in a terminal? What is the shell I am using in MacOS?
user5837
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120
votes
5 answers

what's the purpose of ssh-agent?

I've read the official definition: ssh-agent is a program to hold private keys used for public key authentication (RSA, DSA, ECDSA). The idea is that ssh-agent is started in the beginning of an X-session or a login session, and all other windows…
agent_smith
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120
votes
13 answers

How to create SHA512 password hashes on command line

In Linux I can create a SHA1 password hash using sha1pass mypassword. Is there a similar command line tool which lets me create sha512 hashes? Same question for Bcrypt and PBKDF2.
student
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120
votes
11 answers

How to find which processes are taking all the memory?

I'm looking for somthing like top is to CPU usage. Is there a command line argument for top that does this? Currently, my memory is so full that even 'man top' fails with out of memory :)
ripper234
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120
votes
3 answers

SSH login with clear text password as a parameter?

I need to login to a user that I've created on a remote host running Ubuntu. I can't use an ssh key because the ssh login will happen from a bash script ran within a server that I won't have access to (think continuous integration server like…
mmla
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120
votes
7 answers

Can I safely remove /var/cache?

I am running out of disk space and noted that I have a large /var/cache directory. Can I safely remove this? (using Arch Linux, BTW).
user11780
120
votes
13 answers

ssh_exchange_identification: Connection closed by remote host (not using hosts.deny)

I'm not using hosts.allow or hosts.deny, furthermore SSH works from my windows-machine (same laptop, different hard drive) but not my Linux machine. ssh -vvv root@host -p port gives: OpenSSH_6.6, OpenSSL 1.0.1f 6 Jan 2014 debug1: Reading…
Torxed
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119
votes
6 answers

How to download an archive and extract it without saving the archive to disk?

I'd like to download, and extract an archive under a given directory. Here is how I've been doing it so far: wget http://downloads.mysql.com/source/dbt2-0.37.50.3.tar.gz tar zxf dbt2-0.37.50.3.tar.gz mv dbt2-0.37.50.3 dbt2 I'd like instead to…
BenMorel
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