Chris Down's user avatar
Chris Down's user avatar
Chris Down's user avatar
Chris Down
  • Member for 11 years, 2 months
  • Last seen this week
789 votes
Accepted

Finding the PID of the process using a specific port?

751 votes
Accepted

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

470 votes
Accepted

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

278 votes
Accepted

How to rsync only new files

276 votes
Accepted

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

250 votes
Accepted

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

214 votes
Accepted

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

209 votes

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

209 votes
Accepted

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

179 votes

watch command alias expansion

174 votes

Prepending a timestamp to each line of output from a command

164 votes

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

163 votes
Accepted

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

149 votes
Accepted

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

140 votes
Accepted

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

138 votes
Accepted

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

135 votes
Accepted

Make cd follow symbolic links

133 votes
Accepted

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

124 votes

Find duplicate files

120 votes
Accepted

How to enable reverse search in zsh?

94 votes

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

92 votes
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How do I list all installed programs?

92 votes
Accepted

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

86 votes
Accepted

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

83 votes
Accepted

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

74 votes
Accepted

Using sed to get rid of characters < > ,

74 votes
Accepted

How does the Linux kernel update itself?

72 votes
Accepted

In zsh how can I list all the environment variables?

66 votes

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

66 votes

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

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