User Harold Fischer

5

33

votes

4

answers

5k

views

When creating an empty file, why might one prefer 'touch file' over ': >> file'?

shell files touch

May 27 '18 at 9:27 B from C 61

4

27

votes

2

answers

2k

views

What conditions must be met for a file to be a text file as defined by POSIX?

files posix text

May 30 '18 at 9:49 Michael Homer 64.8k

4

18

votes

3

answers

2k

views

Why is the behavior of the `#!` syntax unspecified by POSIX?

shell posix shebang

Aug 22 at 14:00 Stéphane Chazelas 417k

3

17

votes

2

answers

1k

views

POSIX shell: does `$` lose its special meaning if it is the last character in a word?

shell posix

Jan 6 '19 at 21:59 Isaac 33.7k

9

votes

1

answer

1k

views

When printing a variable that contains newlines, why is the last newline stripped? [duplicate]

shell command-substitution newlines

May 30 '18 at 21:55 Harold Fischer 1,782

2

8

votes

1

answer

637

views

bc: does POSIX prohibit standalone use of relational operators?

posix bc

Dec 23 '19 at 5:32 mosvy 26.3k

1

8

votes

3

answers

8k

views

On the desktop with Bash, should I use '&', nohup, disown, or some combination of the three to start a process and have it run completely on its own?

bash nohup

Oct 25 '19 at 19:39 kubanczyk 1,184

1

6

votes

2

answers

7k

views

What characters need to be escaped when using the printf command?

shell posix printf

Nov 15 '19 at 15:15 Stéphane Chazelas 417k

5

votes

10

answers

3k

views

How can I make sure a string contains at least one uppercase letter, one lowercase letter, one number and one punctuation character?

shell posix pattern-matching

Nov 5 at 23:05 Roman Riabenko 1,182

4

votes

0

answers

107

views

FreeBSD sh: is it possible to import a list of commands into fc without executing them?

shell freebsd fc

Jul 2 '18 at 1:14 Harold Fischer 1,782

3

votes

1

answer

110

views

Are there any shell utilities on modern Unix-like operating systems that cannot operate on text files with really long lines?

shell text-processing posix

Nov 27 '19 at 10:09 Stephen Kitt 294k

3

votes

0

answers

35

views

Should I set the locale to `C` when matching a range of numbers?

shell posix locale pattern-matching

May 27 '19 at 4:01 Harold Fischer 1,782

3

votes

1

answer

2k

views

dash: why am I getting the error “Syntax error: EOF in backquote substitution” when my script doesn't even contain a backquote?

shell quoting dash

Apr 24 '19 at 1:30 mosvy 26.3k

1

3

votes

3

answers

958

views

POSIX Shell: inside of double-quotes, are there cases where `\` fails to escape `$`, ```, `"`, `\` or `<newline>`?

shell quoting posix

Jan 9 '19 at 9:32 Isaac 33.7k

2

votes

1

answer

77

views

Would the inclusion of arrays in POSIX cause the POSIX standard to break?

shell array posix

Aug 18 at 1:39 bk2204 2,233

2

votes

2

answers

127

views

What is the right way to quote nested parameter expansions?

shell quoting posix variable-substitution

Dec 11 '19 at 3:00 muru 58.7k

2

votes

1

answer

100

views

Does SIGQUIT not have the effect of terminating a script in bash?

bash signals

Dec 3 '19 at 7:35 mosvy 26.3k

1

vote

2

answers

98

views

Why must I call sed a second time after substituting spaces with newlines?

sed posix

Feb 2 '20 at 7:01 Harold Fischer 1,782

1

vote

4

answers

540

views

How can I feed a string to awk for the purpose of mathematical calculation?

awk posix math

Mar 1 '19 at 23:56 Harold Fischer 1,782

1

vote

1

answer

323

views

How can I make the title bar dynamically update itself after connecting to a remote machine that uses sh as the default shell?

shell posix xterm

Jul 1 '18 at 22:12 Harold Fischer 1,782

0

votes

0

answers

24

views

Why do newer versions of GNU `ls` have different output in command substitution when dealing with newlines? [duplicate]

ls gnu

Feb 2 '20 at 6:48 Harold Fischer 1,782

0

votes

1

answer

125

views

Is GNU grep's -P option safe to use in production?

grep perl gnu

Jan 22 '20 at 4:05 Ole Tange 25.7k

0

votes

0

answers

520

views

CentOS 7 and 8: how do I prevent third party repositories from overwriting core parts of CentOS?

centos yum repository dnf

Jan 7 '20 at 7:39 Harold Fischer 1,782

0

votes

0

answers

133

views

FreeBSD: how can I check if `/dev/random` is blocking?

freebsd devices random

Aug 18 '19 at 2:29 Harold Fischer 1,782

0

votes

1

answer

130

views

Why doesn't GNU `su` respect end of options?

su gnu

May 21 '19 at 1:14 Michael Homer 64.8k

0

votes

2

answers

317

views

Is the behavior of escaping special characters inside double-quotes in mainstream POSIX-compliant shells at odds with POSIX?

shell quoting posix

Jan 17 '19 at 0:37 Isaac 33.7k

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26 Questions

When creating an empty file, why might one prefer 'touch file' over ': >> file'?

What conditions must be met for a file to be a text file as defined by POSIX?

Why is the behavior of the `#!` syntax unspecified by POSIX?

POSIX shell: does `$` lose its special meaning if it is the last character in a word?

When printing a variable that contains newlines, why is the last newline stripped? [duplicate]

bc: does POSIX prohibit standalone use of relational operators?

On the desktop with Bash, should I use '&', nohup, disown, or some combination of the three to start a process and have it run completely on its own?

What characters need to be escaped when using the printf command?

How can I make sure a string contains at least one uppercase letter, one lowercase letter, one number and one punctuation character?

FreeBSD sh: is it possible to import a list of commands into fc without executing them?

Are there any shell utilities on modern Unix-like operating systems that cannot operate on text files with really long lines?

Should I set the locale to `C` when matching a range of numbers?

dash: why am I getting the error “Syntax error: EOF in backquote substitution” when my script doesn't even contain a backquote?

POSIX Shell: inside of double-quotes, are there cases where `\` fails to escape `$`, ```, `"`, `\` or `<newline>`?

Would the inclusion of arrays in POSIX cause the POSIX standard to break?

What is the right way to quote nested parameter expansions?

Does SIGQUIT not have the effect of terminating a script in bash?

Why must I call sed a second time after substituting spaces with newlines?

How can I feed a string to awk for the purpose of mathematical calculation?

How can I make the title bar dynamically update itself after connecting to a remote machine that uses sh as the default shell?

Why do newer versions of GNU `ls` have different output in command substitution when dealing with newlines? [duplicate]

Is GNU grep's -P option safe to use in production?

CentOS 7 and 8: how do I prevent third party repositories from overwriting core parts of CentOS?

FreeBSD: how can I check if `/dev/random` is blocking?

Why doesn't GNU `su` respect end of options?

Is the behavior of escaping special characters inside double-quotes in mainstream POSIX-compliant shells at odds with POSIX?