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0
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0answers
19 views

Passing argument in tcl proc

I have a tcl proc as follow: proc foo {a {b 300} {check FALSE} {c 100}} { //doing something here } Can I pass the value to c argument while still using default values for b and check arguments ...
0
votes
2answers
66 views

bash execute command for X arguments at a time

I have a list of files stored in txt file. ./test7 ./test4 ./test1 ./test5 ./test6 ./test10 ./test8 ./test2 ./test9 ./test3 I want to run a command on all those files but I want to sleep 1 second ...
1
vote
0answers
22 views

Bash completion - How to get filename completion for suboptions

I have a function which can take main arguments and then sub-arguments. Some of these sub-arguments are filenames. The current completion code I have is as follows. _scm() { local cur prev opts ...
1
vote
0answers
23 views

What Does the Output of “--help” Mean? [duplicate]

When using the --help option of a terminal program, a lot of output is produced. It usually starts with Usage: and then a bunch of things and brackets and parentheses. My question is, what doe the ...
1
vote
3answers
133 views

Shell expansion for arguments?

For example: mkdir ~/{1,2,3} Creates directories ~/1, ~/2, and ~/3. It equates to: mkdir ~/1 mkdir ~/2 mrdir ~/3 But, using the same syntax in the case of CMD < argument > : brew {install, ...
2
votes
1answer
32 views

Order between options and operands?

When using a utility program, we may specify options (and their option arguments) and/or operands. In most cases (in the sense of conforming to some standard (POSIX?)) does the order between ...
2
votes
4answers
53 views

input file stream to command

How is it possible to send a file stream to this command instead of a file? /usr/local/bin/wkhtmltopdf --title "$SUBJECT" -q $SOURCEFILE $OUTPUTFILE The file stream is from a string in PHP.
1
vote
2answers
29 views

Do I need “| xargs -n 1” to get around xargs' -I side-effect?

I was suprised to discover this: $ echo 1 2 3 4 5 | xargs -n 1 echo 1 2 3 4 5 $ echo 1 2 3 4 5 | xargs -n 1 -I FOO echo FOO 1 2 3 4 5 That is, using the -I flag has this side effect: Also, ...
1
vote
1answer
38 views

Using parameters in a script

I usually use the find command to automatically copy certain multimedia files from directory A to directory B. I use the following command: for f in `find ./ -name "*.mkv" -mtime -24h`; do cp $f ...
3
votes
3answers
9k views

How do I echo just 1 column of output from ls command?

Lets say when I do ls command the output is: file1 file2 file3 file4 Is it possible to display only a certain column of output, in this case file2? I have tried the following with no success: echo ...
0
votes
2answers
32 views

How to pass arguments to perl when trying to change a line?

I am using the approach suggested in http://askubuntu.com/questions/434051/how-to-replace-a-string-on-the-5th-line-of-multiple-text-files to modify the first line of an archive. Let's suppose the ...
0
votes
1answer
90 views

/usr/bin/awk: Argument list too long

I am trying to run the following bash script: #!/bin/bash file=$1 filename=${file%%.*} line1=$(sed -n 1~2p ${file}) seqs=$(grep -v '^>' ${file}) pos=$(echo "${line1}" | awk -F"[__]" ...
1
vote
1answer
74 views

pass all files in directory as one argument to perl script

linux beginner here I have a directory with 50 files in it and I want to simultaneously pass them all to a perl script with just a space between names , as in... ./perl_script.pl file1 file2 file3 ...
11
votes
4answers
17k views

Passing named arguments to shell scripts

Is there any easy way to pass (receive) named parameters to a shell script? For example, my_script -p_out '/some/path' -arg_1 '5' And inside my_script.sh receive them as: # I believe this ...
4
votes
3answers
117 views

Bash, insert last used argument of current command

I'm aware that you can recall the last argument of the previous command with !$ and also cycle through previous arguments with ALT + . but can you recall the last argument used for the current command ...
0
votes
0answers
30 views

Pass a function arguments?

How would you make a function that gets arguments? function arg_example { arg "c" # This is imaginary but it would return 'true' if it found the argument -c. did_find_arg=$? # Get the ...
1
vote
3answers
45 views

UNC Argument in bash scipt

I want to create a bash script with a "pure" UNC (i.e. I do not want to escape the backslashes literally) as an argument, i.e. something like: ./foo \\my\share\is\here However, as is natural, the ...
0
votes
0answers
19 views

What's the difference between `set` and `modify` in *nix command syntax

I'm creating a new custom script that will be able to add, modify|set and delete certain rules of DNS records. I was looking for a proper naming convention of *nix tools that might help me name the ...
0
votes
1answer
187 views

Passing variable in init.d script

I have the init.d script show below. I want to start the daemon with the argument --http_root /tv When I start the application without the daemon the argument is accepted However I cannot seem ...
3
votes
1answer
45 views

Shell expansion and positional parameters

I want to make an script equivalent to zgrep or bzgrep, but using tar. I made two very similar attempts and I would like to know if there is a better one and if they could be improved or they are ...
1
vote
1answer
23 views

How do I make an alias to substitute single word in a piped command? [duplicate]

I use aliases a lot but right now only for use cases like alias i='sudo apt-get install -y'. I often would like to add an alias in the following form: alias cmd='echo [something] >> ...
4
votes
2answers
5k views

Bash globbing and argument passing

I have the following simplified bash script #!/bin/bash files=("$@") if [ "X$files" = "X" ]; then files=$HOME/print/*.pdf; fi for file in "${files[@]}"; do ls "$file"; done If I pass ...
15
votes
7answers
1k views

What is the difference between $* and $@?

Consider the following code: foo () { echo $* } bar () { echo $@ } foo 1 2 3 4 bar 1 2 3 4 It outputs: 1 2 3 4 1 2 3 4 I am using Ksh88, but I am interested in other common ...
4
votes
2answers
70 views

Unzip source arguments

To copy a bunch of zip files from one location to another: $ cp *.zip destination/ To unzip a bunch of zip files to a directory: $ unzip \*.zip -d destination/ man unzip says: The backslash ...
0
votes
2answers
79 views

Why doesn't this pipe command work at this special bash script?

That script test.sh doesn't work after used pipe command. The result shows nothing. Why? #!/bin/bash fun=$( echo $1 ) echo "$fun" commands are as follows, $ echo 1 | ./test.sh
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2answers
86 views

Can't use argument in bash date calculation script

The following bash script won't work. I need to calculate the date depending on the number of days since 14th Oct 1582, where the argument will be the number of days. d="$1" date -d '14 Oct 1582 + ...
6
votes
1answer
189 views

Function that calls another function with list of arguments doesn't work

In my .bash_aliases I have defined a function that I use from the command line like this: search -n .cs -n .cshtml -n .html SomeTextIWantToSearchFor /c/code/website/ /c/stuff/something/whatever/ ...
4
votes
2answers
2k views

Is there an easy way to log all commands executed, including command line arguments?

I am trying to find how to log a specific instantiation of rrdtool to see whether the path it is receiving is incorrect. I know I could wrap the executable in a shell script that would log the ...
4
votes
3answers
1k views

How to pass arguments to bash shell script when executing that command with at?

I have a shell script that accepts an argument and uses that in the script. So to run the script I type /path/to/script argument The problem is when trying to setup that file to run using the at ...
1
vote
0answers
87 views

How to pass commandline arguments larger than 131k? [closed]

I want to get data out of a Virtualbox VM. You can define variables (called guestproperties) via commandline, which can be accessed from both the host and the VM. The amount of data for such a ...
2
votes
2answers
187 views

Optional arguments after or before the mandatory arguments?

I'm creating a shell script and I need it to take two mandatory arguments and one optional. How do I check that? In most scripts I've seen, the optional arguments are passed before the mandatory ones, ...
2
votes
1answer
434 views

Why am I getting “too many arguments”

Here's a part of my script that is telling me that I have too many arguments on line 3: #!/bin/bash export LC_ALL='C' if [ `echo "*file 2" | grep -o ^.` = '.' ] then echo success fi Anybody ...
0
votes
0answers
18 views

Find out which arguments an application supports

I have iOS Simulator.app on Mac. Is there a way to find out what arguments can be passed to the app through the command line?
1
vote
2answers
583 views

Check that a bash script has exactly two arguments which are directories

I'm writing a bash script that compares two directories, but I'm not sure how to check conditions For example, if the user enters 1 arg instead of 2 (we need 2 since we're comparing two directories), ...
1
vote
1answer
85 views

Understanding grep and pipes in linux

I came across this post which explains my problem. Suppose there is a file called file.txt which contains "foo World". The answer posted by Tyler explains a lot however I am confused as to how cat ...
5
votes
1answer
98 views

How can I create an alias that passes additional arguments?

I have an executable that I use often: /dir1/dir2/dir3/dir4/executable argv[1] argv[2] argv[3] I know that I can set an alias for the executable: alias myexecutable = ...
35
votes
7answers
3k views

Is `-` used only with cd?

cd - can switch between current dir and previous dir. It seems that I have seen - used as arguments to other commands before, though I don't remember if - means the same as with cd. I found that - ...
3
votes
2answers
48 views

How is it possible to execute a command with an unknown number of arguments in a POSIX shell?

I want to search for multiple words inside the current directory. To accomplish this I use something like this. grep -e "word1" -e "word2" -R . This works fine. Taking this one step further, I ...
1
vote
2answers
520 views

Pass arguments to a command run by another user

I have a bash script that is supposed to take some arguments and then run in a different user: test.sh #!/bin/bash sudo su user2 <<'EOF' echo $1 EOF However it prints blank: $ ./test.sh ...
2
votes
2answers
728 views

bash how to remove options from parameters after processing

I remember having seen somewhere a bash script using case and shift to walk through the list of positional parameters, parse flags and options with arguments when it encounters them, and removes them ...
10
votes
2answers
10k views

Solving “mv: Argument list too long”?

I have a folder with more than a million files that needs sorting, but I cant really do anything because mv outputs this message all the time -bash: /bin/mv: Argument list too long I'm using this ...
2
votes
4answers
200 views

Modify bash arguments if only one argument is set

I created a script with the standard getopt magic, so you can call the script with batman-connect -c ffki How can I add an option to call this script with only one option without dash? ...
7
votes
2answers
880 views

Bash string concatenation used to build parameter list

Given this piece of bash: PARMS='-rvu' PARMS+=" --delete --exclude='.git'" echo $PARMS rsync ${PARMS} . ${TARGET} The echo shows the PARMS string as expected, no error is displayed, but rsync ...
2
votes
1answer
61 views

How to get clicked-on filename as argument of shell script triggered by this mouse-click

If, in Ubuntu's Nautilus, I click a midi-file, a window opens to specify an application for processing the file. Another option is a "user generated command" (UGC). (Let me choose Ubuntu, Nautilus, ...
4
votes
3answers
142 views

Passing arguments from one command into the next

I'm trying to write a script to unify two separate commands I run by hand into a single bash script I can then cron. The first command is a simple find on files with a certain name and size find ...
3
votes
0answers
758 views

When do I need to specify add_efi_memmap as kernel argument in UEFI/EFI boot?

I am reading some tutorials how to EFI stub (efistub) load the Linux kernel. These instructions often use kernel boot parameter add_efi_memmap. The intended hardware is Intel x64 having 8GB of RAM. My ...
0
votes
2answers
184 views

Shell script to work on files in some directory

I am a noob in Linux hence this might come as a silly question. I have a Windows system, so I downloaded cygwin to help me execute Linux/unix commands. I need to execute a shell script on a bunch of ...
5
votes
2answers
309 views

How do you get fgrep to find the literal “--help”?

fgrep --help | fgrep "--help" returns just the whole fgrep --help, how do I return just the lines that have the literal "--help" in them? The quotes don't do anything, nor does \-\-help.
3
votes
1answer
83 views

scp to an alias

To transfer a folder from my local host to a remote host, I normally do: $ scp -r myFolder user@host:destFolder/ Trying to make this easier, I aliased the remote host destination: $ alias ...
23
votes
1answer
712 views

When and how was the double-dash (--) introduced as an end of options delimiter in Unix/Linux?

I don't think the shell/utilities in historical Unix nor in something as "recent" as 4.4BSD supported using a double-dash(or two consecutive hyphens) as an end of options delimiter. With FreeBSD, you ...