Questions tagged [options]
Passing options like -l or --word to commands, or parsing them in scripts.
338
questions
-1
votes
1
answer
48
views
Parsing `-C8` to get value to option -C
I want to parse -C8 to a bash function and get the numeric value in a variable.
I have seen argument parsing implementations for -C 8 and -C=8, but not for -C8.
while (( $# > 0 )); do
case $1 ...
- 1
1
vote
2
answers
81
views
What is the reasoning behind accepting truncated long command line options?
Many command line utilities accept long ("GNU style", according to [1]) options such as --version. To my surprise, truncated versions are often interpreted as the full option. For example, ...
- 119
0
votes
2
answers
136
views
Exit while loop when reaching last positional argument
I want to adapt this so that when the function reaches the last positional argument, the while condition exits.
console_codes ()
{
local exec=0
local narg="$#" iarg=0
while (( narg > 0 ...
- 1
2
votes
1
answer
79
views
Dealing with simple help option far bash function
I have adapted some code I had to handle just a single possible option. Either run the function or use the help option to give a brief description.
activate-jet ()
{
local iarg=0 narg="$#&...
- 1
0
votes
1
answer
2k
views
getopt optional argument with optional value
I am using getopt and want to have an option -l that takes an optional value. I am finding that when matching -l by itself with no argument value provided, I still have to use shift 2 rather than
...
- 1
4
votes
3
answers
1k
views
Looping through command line parameter options until next parameter
In a new addition to a script I am working on, I want to loop through parameters associated with a flag until zsh reaches the next flag in the command. For instance, when the user enters the following:...
- 53
-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
-1
votes
1
answer
72
views
Is it OK if I add a duplicated option when calling an alias for rm?
I have alias rm='rm -i' in .bashrc.
Now, if I use rm -i by mistake, it will become rm -i -i.
Would anything go wrong because of two same options?
- 121
0
votes
2
answers
6k
views
Can you make a bash script's option arguments be optional?
I would like either of these inputs to work. That is, the -n option itself is optional – I already know how to do that – but it then may have an optional parameter on top. If no parameter is given, a ...
- 221
0
votes
0
answers
302
views
difference between environment variables and parsing command line options?
Am I wrong in assuming that both environment variables serve similar purposes - to modify default behaviour of a program from the shell? When writing a program in C, for example, if I am faced with ...
- 263
0
votes
1
answer
291
views
Setting verbosity level from list of function arguments
I am using a bash function to which I pass arguments. I would like to capture if a particular option was defined by the user -v NUM or --verbosity=NUM. If defined as described, I would like to set ...
- 79
2
votes
4
answers
1k
views
When are grouped parentheses for multiple options necessary?
I am using the find and grep commands.
Getting quite confused about when multiple options are joined by "or"
with the -o flag and the use of grouped parentheses, and when grouped parentheses ...
- 393
0
votes
0
answers
95
views
Removing delimiters from bash array elements, then transferring result to another array
I am using an option variable array incl that stores filename extensions.
("--incl")
local incl+=("$2") ; shift 2 ;;
The function can then be called using --incl .texi --...
- 393
0
votes
0
answers
148
views
Handling Optional Arguments in bash
I have the following function that is supposed to write strings in new lines. There is a warning option, so that when -w is set by the user, some lines get coloured in red. -w allows an optional ...
- 393
1
vote
1
answer
2k
views
options with optional values using getopt
I have the following function and would like to look into how options with optional values can be set up using getopt.
Would like to have -w taking on default values
region -w -- "Text"
And ...
- 393