Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

  7. current community

    your communities

    more stack exchange communities

    company blog
The results are in! See what nearly 90,000 developers picked as their most loved, dreaded, and desired coding languages and more in the 2019 Developer Survey.
Unix & Linux
Chris Down
Meta User
Network Profile
summary answers questions tags badges favorites bounties reputation all actions

727 Answers

newest activity votes
478
How can I resolve a hostname to an IP address in a Bash script?
Sep 15 '11 at 16:29
432
Finding the PID of the process using a specific port?
Dec 25 '13 at 5:27
335
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
161
Why is “echo” so much faster than “touch”?
Apr 9 '14 at 4:24
160
How to rsync only new files
Mar 11 '13 at 7:44
158
How do I determine the number of RAM slots in use?
Mar 2 '12 at 16:54
144
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
119
How to use wildcards (*) when copying with scp?
Dec 22 '11 at 13:46
105
In CentOS, what is the difference between yum update and yum upgrade?
Nov 15 '12 at 0:23
105
What is the difference between “sort -u” and “sort | uniq”?
May 16 '13 at 11:28
101
Find duplicate files
Apr 4 '13 at 13:24
98
Make cd follow symbolic links
Nov 14 '12 at 16:24
94
Prepending a timestamp to each line of output from a command
Dec 13 '11 at 11:49
87
How do I check if a variable exists in an 'if' statement?
Jun 25 '15 at 16:36
79
watch command alias expansion
Nov 25 '11 at 12:41
74
What does the “@” (at) symbol mean on OSX ls?
Dec 26 '13 at 8:06
68
How to run a command that involves redirecting or piping with sudo?
Dec 26 '13 at 13:01
64
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
55
Can't use exclamation mark (!) in bash?
Mar 3 '12 at 19:15
52
How can I delete all lines in a file using vi?
Oct 13 '14 at 11:35
49
How can I access a directory outside a chroot from within it?
Nov 14 '12 at 15:52
49
In Bash scripting, what's the meaning of “ $! ”?
Jul 31 '13 at 8:56
46
What do the bash-builtins 'set' and 'export' do?
Apr 4 '13 at 9:45
44
How to enable reverse search in zsh?
Jan 27 '12 at 13:54
38
Automatically detect when I typed “vi” but meant “cd”?
Jan 16 '14 at 5:49
37
Using sed to get rid of characters < > ,
Feb 29 '12 at 22:37
36
Bash is not finding a program even though it's on my path
Jul 14 '13 at 16:09
1 2 3 4 5 … 25