Most Popular
1500 questions
350
votes
21 answers
How can I get a count of files in a directory using the command line?
I have a directory with a large number of files. I don't see a ls switch to provide the count. Is there some command line magic to get a count of files?
Blake
- 3,687
347
votes
27 answers
How can I get my external IP address in a shell script?
I need to find my external IP address from a shell script. At the moment I use this function:
myip () {
lwp-request -o text checkip.dyndns.org | awk '{ print $NF }'
}
But it relies on perl-libwww, perl-html-format, and perl-html-tree being…
Eugene Yarmash
- 15,095
347
votes
4 answers
What do the fields in ls -al output mean?
The ls -al command shows the following output;
-rwxrw-r-- 10 root root 2048 Jan 13 07:11 afile.exe
What are all the fields in the preceding display?
Mr. White
- 3,657
343
votes
5 answers
Sort and count number of occurrence of lines
I have Apache logfile, access.log, how to count number of line occurrence in that file? for example the result of cut -f 7 -d ' ' | cut -d '?' -f 1 | tr '[:upper:]' '[:lower:]' is
a.php
b.php
a.php
c.php
d.php
b.php
a.php
the result that I want…
Kokizzu
- 9,699
342
votes
7 answers
How do I equally balance tmux(1) split panes?
I'm looking for a behavior that is similar to how vim(1) handles its split windows with ^w =. I know tmux(1) has predefined layouts with ^b Meta[1-5], but this likely does not have the layout that I am currently using.
When splitting a window, it…
Aaron Toponce
- 4,634
341
votes
18 answers
Is it possible to see cp speed and percent copied?
I'm having problems when copying large files using nautilus (it gets stuck). I need to copy, using cp. I would like to know if there are any parameters that shows the % copied and also the transfer speed.
user27807
341
votes
4 answers
How to get the pid of the last executed command in shell script?
I want to have a shell script like this:
my-app &
echo $my-app-pid
But I do not know how the get the pid of the just executed command.
I know I can just use the jobs -p my-app command to grep the pid. But if I want to execute the shell multiple…
David S.
- 5,589
341
votes
2 answers
How can I instruct yum to install a specific version of package X?
If there are two (or more) versions of a given RPM available in a YUM repository, how can I instruct yum to install the version I want?
Looking through the Koji build service I notice that there are several versions.
slm
- 369,824
340
votes
5 answers
What's the story behind Super Cow Powers?
As we know, apt-get has Super Cow Powers and aptitude does not:
$ apt-get --help | grep -i cow
This APT has Super Cow Powers.
$ aptitude --help | grep -i cow
This aptitude does not have Super Cow Powers.
and…
derobert
- 109,670
338
votes
5 answers
How can I get the current working directory?
I want to have a script that takes the current working directory to a variable. The section that needs the directory is like this dir = pwd. It just prints pwd how do I get the current working directory into a variable?
user104976
337
votes
5 answers
Why doesn't my Bash script recognize aliases?
In my ~/.bashrc file reside two definitions:
commandA, which is an alias to a longer path
commandB, which is an alias to a Bash script
I want to process the same file with these two commands, so I wrote the following Bash script:
#!/bin/bash
for…
Zaid
- 10,642
335
votes
12 answers
How to terminate a background process?
I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to terminate its process, then re-run the command. How can I terminate it?
I haven't closed its shell window. But as you know it doesn't stop using…
Mohammad Etemaddar
- 12,487
334
votes
10 answers
How to split the terminal into more than one "view"?
From vi, if you issue the command :sp, the screen splits into two "views", allowing you to edit more than one file from the same terminal.
Along those same lines, is there a way to have multiple shells open in the same terminal?
Justin Ethier
- 16,806
333
votes
8 answers
How to reload udev rules without reboot?
How should one reload udev rules, so that newly created one can function?
I'm running Arch Linux, and I don't have a udevstart command here.
Also checked /etc/rc.d, no udev service there.
daisy
- 54,555
332
votes
11 answers
how can I make cron run a job right now, for testing/debugging? without changing the schedule!
I have a cron job that is scheduled to run everyday, other than changing the schedule, is there any other way to do a test run of the command right now to see if it works as intended?
EDIT: (from the comments) I know the command works fine when…
Ali
- 6,943