User Stéphane Chazelas

445 votes

4 answers

75k views

Why not use "which"? What to use then?

asked Aug 1, 2013 at 22:58

255 votes

3 answers

40k views

Security implications of forgetting to quote a variable in bash/POSIX shells

bash shell shell-script security quoting

asked Dec 3, 2014 at 21:59

121 votes

9 answers

11k views

On what systems is //foo/bar different from /foo/bar?

filenames history portability slash

asked Jan 20, 2016 at 10:20

43 votes

1 answer

7k views

Why the "-" in the "#! /bin/sh -" shebang?

shell-script

asked Mar 15, 2017 at 21:39

32 votes

2 answers

3k views

Security implications of running perl -ne '...' *

security perl filenames options

asked Nov 26, 2014 at 8:15

29 votes

3 answers

7k views

How can we know who's at the other end of a pseudo-terminal device?

terminal-emulator open-files pty

asked Jun 11, 2014 at 20:12

28 votes

2 answers

4k views

How to execute an arbitrary simple command over ssh without knowing the login shell of the remote user?

ssh quoting portability

asked May 25, 2015 at 20:11

22 votes

3 answers

3k views

find out which file descriptors share the same "open file description"

file-descriptors

asked Mar 23, 2015 at 11:51

20 votes

2 answers

2k views

Command to retrieve the list of characters in a given character class in the current locale

locale character-encoding

asked May 6, 2014 at 20:23

20 votes

6 answers

5k views

Get the display width of a string of characters

shell-script unicode

asked Nov 23, 2015 at 21:02

19 votes

2 answers

2k views

explanation on chown(1) POSIX spec

posix chown

asked Jun 14, 2014 at 8:06

19 votes

1 answer

927 views

Slurp-mode in awk?

awk

asked Aug 19, 2016 at 12:20

17 votes

1 answer

897 views

How to use associative arrays safely inside arithmetic expressions?

bash security zsh ksh associative-array

asked Jan 4, 2021 at 15:12

17 votes

6 answers

5k views

Store output of a command into a ring-buffer

text-processing logs utilities

asked Aug 4, 2014 at 10:25

15 votes

1 answer

3k views

How to log all system calls made by a process and all its descendants with auditd

linux audit linux-audit

asked Oct 30, 2014 at 12:35

12 votes

2 answers

9k views

Equivalent of "truss -T" and "truss -U" on Linux?

linux signals debugging system-calls truss

asked Jun 21, 2013 at 11:57

9 votes

2 answers

783 views

xtrace equivalent in the fish shell

debugging fish

asked Nov 16, 2015 at 15:04

8 votes

1 answer

347 views

How to display the non-sparse parts of a sparse file?

text-processing sparse-files

asked Mar 26, 2014 at 15:05

8 votes

2 answers

6k views

booting qemu/kvm directly from a file system

boot grub2 qemu bios

asked Oct 29, 2012 at 22:42

8 votes

1 answer

488 views

On what UNIX-like system / filesystem is the st_blocks field returned by stat() not a number of 512-byte units?

stat portability api

asked Sep 18, 2021 at 7:02

7 votes

2 answers

2k views

Is it possible to tell Xorg not to listen on the abstract socket

xorg

asked Feb 3, 2014 at 15:48

6 votes

1 answer

696 views

audit activity on abstract domain sockets?

linux audit

asked Feb 3, 2014 at 15:54

5 votes

2 answers

774 views

Why does $((0.1)) expand to 0.10000000000000001 in zsh?

zsh arithmetic floating-point

asked Feb 5, 2018 at 20:56

5 votes

0 answers

773 views

What chunks are mismatched in a Linux md array?

raid mdadm

asked Jan 20, 2016 at 12:23

3 votes

1 answer

129 views

How do I restore Shift+MouseButton = select when mouse protocol is enabled in xterm 361?

mouse xterm clipboard

asked Oct 29, 2020 at 13:07

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25 Questions

Why not use "which"? What to use then?

Security implications of forgetting to quote a variable in bash/POSIX shells

On what systems is //foo/bar different from /foo/bar?

Why the "-" in the "#! /bin/sh -" shebang?

Security implications of running perl -ne '...' *

How can we know who's at the other end of a pseudo-terminal device?

How to execute an arbitrary simple command over ssh without knowing the login shell of the remote user?

find out which file descriptors share the same "open file description"

Command to retrieve the list of characters in a given character class in the current locale

Get the display width of a string of characters

explanation on chown(1) POSIX spec

Slurp-mode in awk?

How to use associative arrays safely inside arithmetic expressions?

Store output of a command into a ring-buffer

How to log all system calls made by a process and all its descendants with auditd

Equivalent of "truss -T" and "truss -U" on Linux?

xtrace equivalent in the fish shell

How to display the non-sparse parts of a sparse file?

booting qemu/kvm directly from a file system

On what UNIX-like system / filesystem is the st_blocks field returned by stat() not a number of 512-byte units?

Is it possible to tell Xorg not to listen on the abstract socket

audit activity on abstract domain sockets?

Why does $((0.1)) expand to 0.10000000000000001 in zsh?

What chunks are mismatched in a Linux md array?

How do I restore Shift+MouseButton = select when mouse protocol is enabled in xterm 361?