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What is the difference between a symbolic link and a hard link?
Recently I was asked this during a job interview. I was honest and said I knew how a symbolic link behaves and how to create one, but do not understand the use of a hard link and how it differs from a symbolic one.
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Test whether a glob has any matches in bash
...]; then ...
– Tobia
Oct 6 '15 at 10:05
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What's the opposite of head? I want all but the first N lines of a file
Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time.
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Number of processors/cores in command line
I am running the following command to get the number of processors/cores in Linux:
10 Answers
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More elegant “ps aux | grep -v grep”
...0 ? Ss Oct20 0:00 /usr/sbin/sshd -D
$ ps up $(pgrep -f sshddd)
error: list of process IDs must follow p
[stderr output truncated]
$ ps up $(pgrep -f sshddd) 2>&-
[no output]
The above can be used as a function:
$ psgrep() { ps up $(pgrep -f $@) 2>&-; }
$ psgrep sshd
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SQL JOIN vs IN performance?
...behave.
– Quassnoi
Jul 29 '09 at 14:05
>>IN and JOIN are different queries that can yield different results. Can...
How can I call a custom Django manage.py command directly from a test driver?
...ork.
– Igor Sobreira
Dec 5 '12 at 2:05
The opening paragraph applies to any boundary situation. Move your own biz logi...
JavaScript DOM remove element
I'm trying to test if a DOM element exists, and if it does exist delete it, and if it doesn't exist create it.
5 Answers
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Delete empty lines using sed
I am trying to delete empty lines using sed:
13 Answers
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