All Questions
27,258 questions
-7
votes
0
answers
53
views
How does the sudo useradd and use del commands work? [closed]
I don't understand the concept of add and deleting users including the secondary group stuffs
4
votes
3
answers
171
views
Get Character Code for Character in File Name
Short version: I am at a bash command line. In some directory, I can ls various files and see their names. I would like to get something like the ASCII character code for each character in a file's ...
- 43
-4
votes
3
answers
138
views
-5
votes
1
answer
79
views
To have ., the source synonym, workable [closed]
The bash' command
source
has been modified in one of few ways:
alias
function overriding
or else
Then how can its synonym:
.
got being so too (problem is it's not letter) ?
- 87
0
votes
1
answer
18
views
How to set a bind -V variable from the bash command line, not ~/.inputrc? [duplicate]
$ bind -V | grep horiz
print-completions-horizontally is set to `off'
How do I set it to `on' from the bash command line?
I know how to set it in ~/.inputrc. That's not my question.
- 570
2
votes
1
answer
229
views
x2 sudo commands cannot be executed in terminal
I am running a Ubuntu system on my Radxa Zero 3E (single board computer)
Using its GPIO I am driving a 5V LED via an NPN transisitor. Everything works.
For switching it on I use gpioset $(gpiofind ...
- 323
4
votes
2
answers
276
views
Custom separator in ps
I have this integrated in a bash-script on an outdated Debian 10.
ps -axo "%p ;;; %a"
Works well, output is like
10161 ;;; [kworker/0:1-cgroup_destroy]
12173 ;;; [kworker/2:0-events]
12379 ;...
- 1,009
0
votes
3
answers
171
views
Execute bash commands one at a time
I have a list of bash commands that I'd like to execute one at a time. They could be in a file, or the terminal, or whatever is necessary. But I'd like to execute the first one then I'd check the ...
- 280
-8
votes
1
answer
93
views
"File name too long" when printing a long base64 string. Why?
Downloading an image and encoding it into base64:
curl -o output.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/USA-San_Jose-De_Anza_Hotel-3.jpg/500px-USA-San_Jose-De_Anza_Hotel-3.jpg
...
- 5,547
15
votes
2
answers
2k
views
Why does "seq 1000000 | tee /dev/stdout" produce more single-digit numbers than expected?
I'm in Linux and in Bash. I expect
seq 1000000 | tee /dev/stdout
to always output 9 numbers from 1 to 9 and their duplicates (18 in total). But when I do
seq 1000000 | tee /dev/stdout | grep -c '^[1-...
7
votes
1
answer
339
views
Cannot delete bash associative array element
Consider an associative array in bash (versions 5.2.15(1)-release and 5.2.21(1)-release):
declare -A ufs=(); ufs["one"]=1; ufs["two"]=2; ufs["three"]=3
printf '> %s\n' ...
- 128k
7
votes
4
answers
496
views
Grep with output of not the complete line
With grep I can filter lines.
But if the lines are pretty long it gets messy.
How can I only get "some chars around" my search-string?
f.txt
this is a red cat in the room
this is a blue ...
- 1,009
5
votes
4
answers
427
views
How can I find common prefixes in file names to group them?
I would like to be able to find all files in multiple directories whose file names start with the same string, but preferably not if that string is only one word or contains fewer than perhaps 5 ...
- 4,419
4
votes
1
answer
798
views
Why does bash need file descriptor duplicating?
I found out I don't totally understand how bash file descriptors work. I would like to have some guidance here.
I have a scenario where I need to read the content of a file, and for each line of the ...
- 716
1
vote
2
answers
89
views
Use numbered file descriptors with SSH
I need to pipe data through SSH to a command that reads stdin. The command needs to run with sudo so I need to be able enter the sudo password, too. Without ssh, I'd use numbered file descriptors like ...
- 434