User Chris Down

789 votes

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Finding the PID of the process using a specific port?

answered Dec 25, 2013 at 5:27

751 votes

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How can I resolve a hostname to an IP address in a Bash script?

answered Sep 15, 2011 at 16:29

470 votes

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Execute vs Read bit. How do directory permissions in Linux work?

answered Sep 22, 2011 at 12:33

278 votes

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How to rsync only new files

answered Mar 11, 2013 at 7:44

276 votes

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How do I determine the number of RAM slots in use?

answered Mar 2, 2012 at 16:54

250 votes

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How to check if a shell is login/interactive/batch

answered Dec 13, 2011 at 23:19

214 votes

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What does env x='() { :;}; command' bash do and why is it insecure?

answered Sep 24, 2014 at 20:10

209 votes

How to use wildcards (*) when copying with scp?

answered Dec 22, 2011 at 13:46

209 votes

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In CentOS, what is the difference between yum update and yum upgrade?

answered Nov 15, 2012 at 0:23

179 votes

watch command alias expansion

answered Nov 25, 2011 at 12:41

174 votes

Prepending a timestamp to each line of output from a command

answered Dec 13, 2011 at 11:49

164 votes

Why is "echo" so much faster than "touch"?

answered Apr 9, 2014 at 4:24

163 votes

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What is the difference between "sort -u" and "sort | uniq"?

answered May 16, 2013 at 11:28

149 votes

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What does the "@" (at) symbol mean on OSX ls?

answered Dec 26, 2013 at 8:06

140 votes

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How do I check if a variable exists in an 'if' statement?

answered Jun 25, 2015 at 16:36

138 votes

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Day of week {0-7} in crontab has 8 options, but we have only 7 days in a week

answered Dec 20, 2013 at 9:09

135 votes

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Make cd follow symbolic links

answered Nov 14, 2012 at 16:24

133 votes

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How to run a command that involves redirecting or piping with sudo?

answered Dec 26, 2013 at 13:01

124 votes

Find duplicate files

answered Apr 4, 2013 at 13:24

120 votes

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How to enable reverse search in zsh?

answered Jan 27, 2012 at 13:54

94 votes

Can't use exclamation mark (!) in bash?

answered Mar 3, 2012 at 19:15

92 votes

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How do I list all installed programs?

answered Sep 18, 2011 at 20:26

92 votes

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In Bash scripting, what's the meaning of " $! "?

answered Jul 31, 2013 at 8:56

86 votes

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What does the 'd' mean in ls -al results and what is that slot called?

answered Dec 21, 2012 at 17:49

83 votes

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What do the bash-builtins 'set' and 'export' do?

answered Apr 4, 2013 at 9:45

74 votes

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Using sed to get rid of characters < > ,

answered Feb 29, 2012 at 22:37

74 votes

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How does the Linux kernel update itself?

answered Jan 21, 2020 at 13:48

72 votes

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In zsh how can I list all the environment variables?

answered Feb 3, 2012 at 15:05

66 votes

How to put a newline special character into a file using the echo command and redirection operator?

answered Mar 21, 2015 at 23:00

66 votes

How can I delete all lines in a file using vi?

answered Oct 13, 2014 at 11:35

Stack Exchange Network

773 Answers

Finding the PID of the process using a specific port?

How can I resolve a hostname to an IP address in a Bash script?

Execute vs Read bit. How do directory permissions in Linux work?

How to rsync only new files

How do I determine the number of RAM slots in use?

How to check if a shell is login/interactive/batch

What does env x='() { :;}; command' bash do and why is it insecure?

How to use wildcards (*) when copying with scp?

In CentOS, what is the difference between yum update and yum upgrade?

watch command alias expansion

Prepending a timestamp to each line of output from a command

Why is "echo" so much faster than "touch"?

What is the difference between "sort -u" and "sort | uniq"?

What does the "@" (at) symbol mean on OSX ls?

How do I check if a variable exists in an 'if' statement?

Day of week {0-7} in crontab has 8 options, but we have only 7 days in a week

Make cd follow symbolic links

How to run a command that involves redirecting or piping with sudo?

Find duplicate files

How to enable reverse search in zsh?

Can't use exclamation mark (!) in bash?

How do I list all installed programs?

In Bash scripting, what's the meaning of " $! "?

What does the 'd' mean in ls -al results and what is that slot called?

What do the bash-builtins 'set' and 'export' do?

Using sed to get rid of characters < > ,

How does the Linux kernel update itself?

In zsh how can I list all the environment variables?

How to put a newline special character into a file using the echo command and redirection operator?

How can I delete all lines in a file using vi?