Passing options like -l or --word to commands, or parsing them in scripts

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2
votes
1answer
507 views

Automatically start an application with a modifed LD_PRELOAD?

I have an application that needs a modified LD_PRELOAD. I want to start the application using the originally provided rc script, so I can benefit from an automatically updated rc script on an update ...
5
votes
1answer
67 views

how to input this command line

hume@linux-o1dm:~> gnomesu -u legum java -jar '/home/legum/frem/frem.jar' Unknown option -jar I want -u for gnomesu and -jar for java, but the openSUSE treat -u -jar only for gnomesu. What is ...
2
votes
2answers
729 views

Passing options to subcommands in bash

I'm scripting a sequence of commands I used to enter by hand. The rough outline goes something like this $ echo ${FILENAME_ARGS} | some | big | pipeline | sort -options | etc >temp $ gs ...
2
votes
1answer
189 views

diff --git unknown option

when I try to run diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c I get unknown option (I have installed git via apt-get install git)
3
votes
1answer
104 views

What is “userdel --root?” supposed to do

On a GNU/Linux system, I found the following, (for me very confusing seeming entry) about an option for userdel in the German version of its man page: I'm truly sorry, but I can't really provide ...
0
votes
1answer
145 views

How to make options mandatory in KSH script

Here is the skeleton to catch arguments in my script : # fMain(){ while getopts "d:e:h" _OPTION; do case $_OPTION in d) ...
4
votes
3answers
782 views

What is a “non-option argument”?

I am trying to understand info who but completly fail at the term »non-option argument«. Can someone please explain this term to me in simple words or an example? UPDATE: from ' info who' ...
3
votes
2answers
3k views

cp -L vs. cp -H

Problem When copying files with cp -H or cp -L, I get the same results: $ ls -l fileA fileA -> fileB $ cp fileA somewhere/ -H $ ls -l somewhere/ fileA # fileA is a copy of fileB, only ...
4
votes
3answers
3k views

convert soft- to hardlinks with cp

The cp command's infopage offers on the option --preserve= the following: links Preserve in the destination files any links between corresponding source files. Note that with -L' ...
1
vote
2answers
4k views

The -cp option to the java command [closed]

java -cp FILE.jar FILE.Main inputfile What does the -cp option mean? For that matter, what a negative sign in front mean? I've searched everywhere and couldn't find the answer.
2
votes
3answers
827 views

Restrict standard users to run a command with a specific argument

I know how to restrict standard users to run a command by removing execute permissions for that command. But it's possible restrict standard users to run a command with a specific option/argument? ...
5
votes
3answers
406 views

What's the real point of the -f option on rm?

By reading the GNU coreutils man page for rm, one of the options is -f, which according to the manual, -f, --force ignore nonexistent files and arguments, never prompt Now, I made some ...
0
votes
1answer
367 views

Does SerNet compile Samba 4 with CUPS support? (How to tell in general?)

I have SerNet Samba 4.0.9 installed on CentOS 6.4. How can I tell if it was compiled with CUPS support?
16
votes
1answer
31k views

How can I execute local script on remote machine and include arguments?

I have written a script that runs fine when executed locally: ./sysMole -time Aug 18 18 The arguments "-time", "Aug", "18", and "18" are successfully passed on to the script. Now, this script is ...
3
votes
1answer
284 views

mount --no-canonicalize?

Neither man nor info page provide more information on this than: mount --no-canonicalize Don't canonicalize paths. The mount command canonicalizes all paths (from command line or fstab) ...
1
vote
1answer
206 views

useradd --no-log-init [comprehension question]

TLDR: How is useradd --no-log-init actually used [in GNU/Linux [Debian]? I read the command's man and info page about this option as: »user will not be listed in the lastlog and faillog files ...
3
votes
1answer
424 views

difference between useradd -b and useradd -d

Can somebody please explain to me the exact differences between useradd -b and useradd -d in [Debian] Linux? Both seem to work quite similar to me, but then I spot differences that confuse me.
0
votes
1answer
159 views

wc - setting a terminating character

I've got that far: wc --files0-from=FILE lets one get the word count of a list of files. Each entry in this list mus be terminated with an ASCII NUL character. Question: A way to set a terminating ...
5
votes
2answers
5k views

syntax of ls --hide= and ls --ignore=

ls --hide and ls --ignore provides the possibility leave out files defined through regular expressions set after the --ignore= part. The latter makes sure that this option isn't turned off via -a, -A. ...
2
votes
1answer
804 views

How to autologin with XDM?

How to autologin a specified user with xdm? I know it's possible with other display managers but I wasn't able to figure out how xdm has to be configured to autologin a certain user. Is it possible? ...
34
votes
7answers
5k views

why does ls -d also list files, and where is it documented?

when specifying ls --directory a* it should list only directories starting with a* BUT it lists files AND directories starting with a Questions: where might I find some documentation on this, ...
3
votes
1answer
328 views

Understanding grep --label=

I am looking for an explanation how grep --label=LABEL works: Maybe somebody can give me an example [or two] on what --label= is for. I understand what grep and zgrep are supposed to do – the ...
1
vote
2answers
110 views

mount defaults and various filesystems

I read on the man page defaults Use default options: rw, suid, dev, exec, auto, nouser, async, and relatime. Do the options set depend on a mounted filesystem or not?
1
vote
1answer
836 views

mplayer -msglevel all=-1 doesn't make it completely silent!

I'm trying to open mplayer to play video without any terminal output using this: mplayer -msglevel all=-1 /path/to/video also: mplayer -really-quiet /path/to/video but it doesn't make it ...
2
votes
1answer
281 views

Simpler processing of shell script options

I'm looking for way to process shell script arguments that is cleaner and more "self documenting" than getopt/getopts. It would need to provide... Full support of long options with or without a ...
8
votes
3answers
10k views

getopt, getopts or manual parsing - what to use when I want to support both short and long options?

Currently I'm writing a Bash script which has the following requirements: it should run on a wide variety of Unix/Linux platforms it should support both short and (GNU) long options I know that ...
5
votes
1answer
1k views

In the usage string of my custom shell script, shall I also display --help and --version?

I'm currently developing a shell script, called up, which shows a usage string on the commandline when called with --help. The output looks like this: $ up --help usage: up [-n ...
21
votes
2answers
683 views

What is `--` called?

Recently I got to know of -- that is double-hyphen which is used to tell a command that the option list has ended and what follows should not be considered as a option. So, grep -- 'search_word' * ...
4
votes
2answers
12k views

How can I detect that no options were passed with getopts?

I have this code - #getoptDemo.sh usage() { echo "usage: <command> options:<w|l|h>" } while getopts wlh: option do case $option in (w) name='1';; ...
1
vote
1answer
459 views

What is the canonical way to implement order independent options in bash scripts? [duplicate]

Possible Duplicate: How do I handle switches in a shell script? Most common shell commands allow the user to specify options in any random order. Positional Parameters like $1 as commonly ...
1
vote
1answer
428 views

How does “options” in shell scripting work?

I found some code in one of the answers here and accommodated it to my needs but now I have two questions: Q1: how can I display the options text after the code in case statement finishes? So the ...
5
votes
1answer
268 views

Handling filenames that contains a hyphen, within a script

I have few files that was incorrectly encoded, during extraction, file names now become something similar to -a -b, Now I'm trying to fix this issue with: convmv -f ENCODING -t utf8 --notest * But ...
3
votes
2answers
832 views

Is it possible to disable verbose in the middle of running?

I am running a program fls (from the Sleuth Kit) with option -v for verbose mode. However it takes too long, and the program is still running since yesterday. I guess it will run faster without ...
4
votes
1answer
2k views

What does Linux's “nointremap” option do?

Ubuntu 12.10 alpha 2 works perfectly on my new 11" 2012 Macbook Air, but only when I boot with the "nointremap" option. Supposedly this is not good to use as a permanent solution. What exactly does ...
2
votes
2answers
675 views

How to change a firefox option on a quick way (via shortcuts, command line,..)?

In Firefox we have two options at Firefox->Preferences->Preferences->Fonts and colors->Colors menu, Use system colors and Sites can use other colors. I would like keep the first one ...
6
votes
3answers
770 views

What's the purpose of `rm -P`?

I was reading the man page for rm when I came across this option: -P Overwrite regular files before deleting them. Files are overwritten three times, first with the byte pattern 0xff, then ...
5
votes
2answers
3k views

Download list of files if they don't already exist

If I have a list of URLs separated by \n, are there any options I can pass to wget to download all the URLs and save them to the current directory, but only if the files don't already exist?
2
votes
2answers
2k views

List of available command options?

I'm currently setting up my first web server without a control panel and so far things are going pretty good! I was just wondering if anyone could direct me to somewhere that explains all of the ...
5
votes
3answers
2k views

Remove many many many files from a folder

I have a folder with 137795 files in it. I need to delete all of them. When I run rm * I get -bash: /bin/rm: Argument list too long. How do I get past this error?
4
votes
1answer
146 views

If I'm logged in as root, how do I restart mysql or apache with options?

I know the commands to restart/stop/start, but when I try to pass options it doesn't seem to work! CENTOS 6, MySQL 5.14 service mysql restart service httpd restart Then I tried this: ...
3
votes
2answers
905 views

Getopts option processing, Is it possible to add a non hyphenated [FILE]?

I'm using getopts for all of my scripts that require advanced option parsing, and It's worked great with dash. I'm familiar with the standard basic getopts usage, consisting of [-x] and [-x OPTION]. ...
2
votes
2answers
1k views

How to find every symbolic link on a server?

I need to find every symbolic link on the server. The version is AIX 6.1. man find says -L Follow symbolic links But find -L is not a proper usage. Usage: find [-H | -L] Path-list ...
2
votes
1answer
2k views

Altering the default boot option on CentOS

I recently installed a copy of CentOS onto my main hard drive (I now have Windows 7 and CentOS). Whilst installing CentOS, I accidentally set it to be the main boot option, so when I start my PC I ...
16
votes
2answers
15k views

tar cvf or tar -cvf ?

I have learned to use tar without '-' for options, like tar cvfz dir.tar.gz Directory/ but I recently came accross the slightly different tar -czvf syntax (I think the 'f' must be the last option in ...
1
vote
4answers
359 views

What is this Bash line supposed to mean?

find . -name "*.html" -exec grep -l somethingtobefound {} \; I was just wondering what the keywords "-name" "-exec" "-l" "{}" "\" and ";" were supposed to signify. Also, I commonly see ...
5
votes
4answers
513 views

How can I create a empty file whose name begins with a dash? [duplicate]

How can we create a empty file with the unix name -stuff. It means the name start with -. I tried with touch -stuff but it didn't work.
24
votes
4answers
5k views

Single dashes `-` for single-character options, but double dashes `--` for words?

Where did the convention of using single dashes for letters and doubles dashes for words come from and why is continued to be used? For example if I type in ls --help, you see: -a, --all ...
9
votes
4answers
8k views

How do I handle switches in a shell script?

Are there some built-in tools that will recognize -x and --xxxx as switches, and not arguments, or do you have to go through all the input variables, test for dashes, and then parse the arguments ...
3
votes
1answer
3k views

How to run a specified codeblock with getopts when no options or arguments are supplied?

So I am writing a script that mixes options with arguments with options that don't. From research I have found that getopts is the best way to do this, and so far it has been simple to figure out and ...
5
votes
2answers
85 views

Handling an option-like filename in the shell [duplicate]

Possible Duplicate: How do I delete a file whose name begins with "--"? Due to mismatched switches when I was trying to run a command, I have a log file named -w in a directory. I ...