All Questions
Tagged with options command-line
52
questions
0
votes
1
answer
48
views
What is the difference between quotes wrap around only the option value vs quotes wrap around the option name and option value?
What is the difference between
quotes wrap around only the option value
eg: grep --file="grep pattern file.txt" *
vs
quotes wrap around the option name and option value
eg: grep "--...
- 133
4
votes
2
answers
4k
views
What precisely does cp -b (--backup) actually do?
Before you hit me with the obvious, I know, the backup option makes a backup of a file.
But the thing is, the cp command in general backs up a file. One could argue a copy of a file is a backup.
So ...
0
votes
1
answer
93
views
less command: b/f vs w/s
About the less and according with:
Less command
Linux / Unix Colored Man Pages With less Command
indicates the following:
f ^F ^V SPACE * Forward one window (or N lines).
b ^B ESC-v * Backward ...
- 1,786
5
votes
2
answers
837
views
less command g vs p option
In less for navigation purposes according with this tutorial
Less Command in Linux
indicates:
g Go to the first line in the file.
p Go to the beginning of the file.
I tested both, and of course ...
- 1,786
0
votes
1
answer
688
views
ERROR: Unrecognized option: --host_jvm_args=-Xmx4g
OS: Linux
Distrib: Debian GNU/Linux 10 (buster)
bazel: v3.1.0
I try to get the memory limit to 4GB for bazel, but I get the error:
ERROR: Unrecognized option: --host_jvm_args=-Xmx4g
The whole ...
- 414
1
vote
2
answers
81
views
What is the reasoning behind accepting truncated long command line options?
Many command line utilities accept long ("GNU style", according to [1]) options such as --version. To my surprise, truncated versions are often interpreted as the full option. For example, ...
- 119
-1
votes
1
answer
169
views
ls -l | cut -c1-11,50- Can Someone Explain the 2nd part after the pipe?
I have taken a course in that suddenly I saw this, I understood until the pipe but the options used after the pipe for the command cut are bit confusing
0
votes
1
answer
63
views
How to specify boolean value in argument to external command?
The man page for txt2html says:
--make_links
Should we try to build links? If this is false, then the links dictionaries are not consulted and only structural text-to-HTML ...
- 315
1
vote
1
answer
1k
views
If no argument is given to mandatory option, zparseopts takes next option as the argument
I am using zsh 5.4.2. The function that is causing issue is:
function zp () {
zparseopts -E -watch:=o_watch -show=o_show
echo "show : $o_show"
echo "watch ...
- 2,738
1
vote
1
answer
1k
views
How do I make an option (not argument of the option) mandatory in zparseopts?
In the example bellow:
function zp () {
zparseopts -E -walk:=o_walk
echo "walk: $o_walk"
}
I get the following output:
$ zp --walk "Walking"
walk : --walk ...
- 2,738
0
votes
1
answer
1k
views
find option as command line argument
I have got a problem with my script. I am trying to write a script, where option for command find is the first command line argument.
In my script I've got something like
find_option=$1
find $...
37
votes
2
answers
9k
views
Do command line options take an equals sign between option name and value?
Just using kubectl as an example, I note that
kubectl run --image nginx ...
and
kubectl run --image=nginx ...
both work.
For command-line programs in general, is there a rule about whether an equals ...
- 701
0
votes
2
answers
101
views
Stop executables and built-ins from interpreting a string argument starting with - as a switch? [duplicate]
Let's say I want to search a file for a string that begins with a dash, say "-something":
grep "-something" filename.txt
This throws an error, however, because grep and other executables, as well as ...
- 129
-2
votes
2
answers
2k
views
Command du -xh / | grep -P "G\t" explained?
I came across the command
du -xh / | grep -P "G\t"
I am interested in the switch -P of grep and what does it do. Also, can anyone explain what the "G\t" part does?
Please do not ...
- 160
2
votes
3
answers
1k
views
On a Mac, how can I list contents of a non-current directory without showing backup files (ending with ~), preferably with BSD command ls?
My system:
OS: MacOS / Mac OS X (Mojave 10.14.5)
OS core: Darwin (18.6.0)
Kernel: Darwin Kernel / XNU (18.6.0 / xnu-4903.261.4~2/RELEASE_X86_64)
ls: version unknown, but man ls gives a page from the ...
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