Unix & Linux
Chris Down
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727 Answers

Newest Activity Votes
500
How can I resolve a hostname to an IP address in a Bash script?
Sep 15 '11 at 16:29
455
Finding the PID of the process using a specific port?
Dec 25 '13 at 5:27
339
Execute vs Read bit. How do directory permissions in Linux work?
Sep 22 '11 at 12:33
200
What does env x='() { :;}; command' bash do and why is it insecure?
Sep 24 '14 at 20:10
168
How to rsync only new files
Mar 11 '13 at 7:44
163
How do I determine the number of RAM slots in use?
Mar 2 '12 at 16:54
161
Why is “echo” so much faster than “touch”?
Apr 9 '14 at 4:24
153
How to check if a shell is login/interactive/batch
Dec 13 '11 at 23:19
124
Day of week {0-7} in crontab has 8 options, but we have only 7 days in a week
Dec 20 '13 at 9:09
123
How to use wildcards (*) when copying with scp?
Dec 22 '11 at 13:46
111
What is the difference between “sort -u” and “sort | uniq”?
May 16 '13 at 11:28
108
In CentOS, what is the difference between yum update and yum upgrade?
Nov 15 '12 at 0:23
103
Find duplicate files
Apr 4 '13 at 13:24
100
Make cd follow symbolic links
Nov 14 '12 at 16:24
96
Prepending a timestamp to each line of output from a command
Dec 13 '11 at 11:49
92
How do I check if a variable exists in an 'if' statement?
Jun 25 '15 at 16:36
85
watch command alias expansion
Nov 25 '11 at 12:41
79
What does the “@” (at) symbol mean on OSX ls?
Dec 26 '13 at 8:06
70
How to run a command that involves redirecting or piping with sudo?
Dec 26 '13 at 13:01
68
How do I list all installed programs?
Sep 18 '11 at 20:26
60
What does the 'd' mean in ls -al results and what is that slot called?
Dec 21 '12 at 17:49
56
Can't use exclamation mark (!) in bash?
Mar 3 '12 at 19:15
53
How can I delete all lines in a file using vi?
Oct 13 '14 at 11:35
50
How can I access a directory outside a chroot from within it?
Nov 14 '12 at 15:52
50
In Bash scripting, what's the meaning of “ $! ”?
Jul 31 '13 at 8:56
48
How to enable reverse search in zsh?
Jan 27 '12 at 13:54
47
What do the bash-builtins 'set' and 'export' do?
Apr 4 '13 at 9:45
41
Using sed to get rid of characters < > ,
Feb 29 '12 at 22:37
38
Binary to hexadecimal and decimal in a shell script
Feb 19 '13 at 7:40
38
Automatically detect when I typed “vi” but meant “cd”?
Jan 16 '14 at 5:49
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