Questions tagged [posix-compliant]
11 questions
188
votes
4 answers
How to grep for tabs without using literal tabs and why does \t not work?
When I search for tabs in a file with (e)grep I use the litteral tab (^v + ). I can not utilize \t as a replacement for tabs in regular expressions. With e.g. sed this expression works very well.
So is there any possibility to use a…
Lasall
- 3,673
- 4
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- 33
5
votes
0 answers
stropts.h install for Ubuntu 20.01
I have just installed Ubuntu 20.04 and am trying to compile my pintOS project and it says stropts.h not found and I have researched a bit that it only works on Ubuntu 18.04. Someone share a way to compile my project by getting stropts.h file.
I've…
Benny Joseph
- 51
- 1
- 2
4
votes
1 answer
In bash `$-` yields `himBHs` but `i` and `s` are invalid options -- what's going on?
$ echo $-
himBHs
$ set -h
$ set -i
bash: set: -i: invalid option
set: usage: set [-abefhkmnptuvxBCHP] [-o option-name] [--] [arg ...]
$ set -m
$ set -B
$ set -H
$ set -s
bash: set: -s: invalid option
set: usage: set [-abefhkmnptuvxBCHP] [-o…
Craig Hicks
- 809
- 7
- 18
3
votes
2 answers
How to skip a record with awk
I have a large number of files in a log-directory, whose names were time-stamped (in this case with date +%b[...]).
I want to write a POSIX compliant one-liner that will:
either
skip lines output from ls -ltc that have 2 fields or less (as
seen by…
Cbhihe
- 2,731
- 3
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- 47
3
votes
1 answer
What's the difference between `;` and space when setting environment variable before running a command
I've been wondering what's the difference between the two:
CAROOT='certificates'; echo $CAROOT - prints the value, uses ; as separator between two commands
CAROOT='certificates' echo $CAROOT - prints empty value.
I wonder why the former command…
The.Wolfgang.Grimmer
- 131
- 2
1
vote
1 answer
How compatible dash is with ksh?
Can I make /bin/sh symlinked to /bin/ksh instead of /bin/dash without breaking anything in the process ? Since they're both supposed to be POSIX-compliant, can I reasonably expect the replacement to go without issues?
Sergiy Kolodyazhnyy
- 103,293
- 19
- 273
- 492
1
vote
2 answers
list files or dirs starting with 'jre'
I need to list files and dirs with names starting with jre (small and capital letters are allowed).
When I execute:
ls | grep jre
...it greps just low capital letters and gives output with jre not only in start position. Actually I have feeling…
vico
- 4,447
- 20
- 55
- 87
0
votes
1 answer
Why sigset includes unadded SIGINT?
Wrote simple program to learn writing POSIX style signal handling.
#include
#include
#include
#include
static void sig_int(int);
int
main(void)
{
sigset_t waitmask;
if (signal(SIGINT, sig_int)…
Bulat M.
- 841
- 4
- 14
- 32
0
votes
1 answer
Bash from scratch --again
As my journey through Bash goes on, I'm still stuck on ridiculous stuff such as this script I just can't wrap my head around on:
#!/bin/bash
if [ $1 -gt 100 ]
then
echo "You typed a larger number"
if (( $1 % 2 == 0 ))
then
echo "And…
Sneakatoo
- 25
- 3
0
votes
1 answer
how to run an appimage app stored at a fat32 storage
As appimage aims to allow portability I was expecting something very similar to the apple .app format (apple.application-bundle) .
I don't know how to launch an app from an appimage file stored in a fat32 USB (macOS allows it from its .app…
Daniel Perez
- 101
- 4
-1
votes
1 answer
Why doesn’t Ubuntu's `time` follow the standard POSIX format and how do I change it?
If you measure times in Ubuntu 18.04, the result apears in a single line:
$ time sleep 1
sleep 1 0.00s user 0.00s system 0% cpu 1.003 total
This doesn’t align with the POSIX standard, as described in time’s man page:
-p, --portability
Use…
pvorb
- 101
- 2