Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: What does this shell script do? Need in depth explanation please
Top Forums Shell Programming and Scripting What does this shell script do? Need in depth explanation please Post 302982164 by shadowknight777 on Sunday 25th of September 2016 07:43:25 PM
Old 09-25-2016
What does this shell script do? Need in depth explanation please
Hi

My friend wrote this particular script and won't tell me what it does, and when I run it I don't understand it.

What does the entire script do with specifics please.

Thanks
Bob

Code:
#!/bin/bash
current=0
while [ $SECONDS -le 10 ]; do
if [ $SECONDS -eq ${current} ]; then
echo ${current}
current=$((${current}+1))
fi
done

Last edited by Don Cragun; 09-25-2016 at 11:44 PM.. Reason: Add CODE tags.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

any explanation for thsi shell script behaviour

hello whats the difference between excuting a shell script as a)sh myscript.sh b). ./myscript.sh i noticed that my shell script works fine when i run it as . ./myscript .sh but fails when i run it as sh myscript.sh could anybody explain why. the shell script is very simple ... (9 Replies)
Discussion started by: xiamin
9 Replies

2. Shell Programming and Scripting

Script explanation

I have the following script awk '$1 ~ /^*+/ { s += $NF; m++ } END { print NR, m, s } and I use it to get results from the following file A4792 4 COMP9021 5 K9 7 ABC 8 924 1 R2D2 3 (8 Replies)
Discussion started by: sickboy
8 Replies

3. Shell Programming and Scripting

Need explanation of script

Hi All, Can anybody explain what this script is doing? #!/bin/sh who | cut -d " " -f1 | sort -u > userlist1 while true ; do sleep 60 who | cut -d" " -f1 | sort -u >userlist2 for username in `cat userlist1` ; do if ! grep "^$username$" userlist2 > /dev/null ; then echo... (0 Replies)
Discussion started by: vishalpatel03
0 Replies

4. Shell Programming and Scripting

explanation for a script

Guys, was wondering what the meaning of the below bit is ? awk -F ' ' '{print $1 " " $2 ;}' $TEMPFILE | (rm -f $TEMPFILE; sed 's/$/ '"$box"'/g' > $TEMPFILE) Can anyone explain this in detail? what is the significance of rm -f $TEMPFILE here? What all IO/buffering happens here ?How the... (0 Replies)
Discussion started by: hashin_p
0 Replies

5. Shell Programming and Scripting

Shell Script Explanation

Hello, I have seen this script on this site. I understand most of it. However I am a bit stuck on the part in red. It appears to be expanding for file in *.zip do zipdir=${file%.*} mkdir $zipdir || echo "unable to create $zipdir" cp $file $zipdir || echo "unable to copy $file"... (3 Replies)
Discussion started by: jaysunn
3 Replies

6. Shell Programming and Scripting

Script explanation

#script fileused=test.txt hostname=test.dis.com ftp $hostname <<-! > $fileused.err 2>&1 put file.txt /usr/text.txt bye ! kindly the above script the one marked as Bold and underlined as the above i am declaring the new variable as filename ,But when i used i had used as $fileused.err... (1 Reply)
Discussion started by: rajar_r
1 Replies

7. Shell Programming and Scripting

need an explanation on this script...

The following script will create a directory in a directory and will go on as many times as the number you will give in. I am trying to find out how it works ... can someone please help me with that? #!/bin/sh #create a variable and set it to 1 n=1 #start a loop as... (3 Replies)
Discussion started by: I-1
3 Replies

8. Solaris

Explanation of script

Hello Guys, can someone help explain the script below for me? I will really appreciate it. vi db_script #!/bin/sh echo .cron job run on.`date`> cronjob.txt df -h >> cronjob.txt echo welcome to home (2 Replies)
Discussion started by: cjashu
2 Replies

9. Shell Programming and Scripting

How to write Perl Script to Get MQ Queue Depth?

Hi , I got the following script from internet to display queue depth using Perl Script. However, when I execute it , im getting following error. Can anyone shed light on what is going wrong? #!/usr/bin/perl ## 07/23/01 ## Depth Inquiry sample program. ## Arguments: ## Connects to... (11 Replies)
Discussion started by: srkmish
11 Replies

10. Shell Programming and Scripting

Shell script explanation

Hey, can someone explain me this script? i=0 while read WORT do echo $WORT|grep a>/dev/null || echo$WORT|grep B>dev/null || let i=$i+1 done echo $i The first lane initializie the variable i with the value of 0. The loop line has 3 different options because of ||. The only option I... (10 Replies)
Discussion started by: newuser21
10 Replies

LEARN ABOUT OSX

locale::script

Locale::Script(3pm)					 Perl Programmers Reference Guide				       Locale::Script(3pm)

NAME

       Locale::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. A code set may be specified using either a name, or a constant
       that is automatically exported by this module.

       For example, the two are equivalent:

	  $script = code2script('phnx','alpha');
	  $script = code2script('phnx',LOCALE_SCRIPT_ALPHA);

       The codesets currently supported are:

       alpha, LOCALE_SCRIPT_ALPHA
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.  It also includes additions to this set
	   included in the IANA language registry.

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       num, LOCALE_SCRIPT_NUMERIC
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Script::delete_script  ( CODE [,CODESET] )
       Locale::Script::add_script_alias  ( NAME ,NEW_NAME )
       Locale::Script::delete_script_alias  ( NAME )
       Locale::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::delete_script_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.unicode.org/iso15924/
	   Home page for ISO 15924.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11						       Locale::Script(3pm)
All times are GMT -4. The time now is 05:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy