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Full Discussion: Showing 4 digits
Top Forums Shell Programming and Scripting Showing 4 digits Post 302979388 by Don Cragun on Saturday 13th of August 2016 12:35:22 PM
Old 08-13-2016
Quote:
Originally Posted by remibemol
thank you so much for your welcome.

I was thinking about to use that, the problem is that originaly I had a script witch allow me to include this number in a comand to download some file.
Code:
count=0
while read p; do
  echo wget -O "$2_img${count}.jpg" $p
  count=$((count+1))
  
done <2

then, with your script I manadge to print all the line of the file,
but then it's does't seem to work to create command

I put echo to debug it but I want to make it part of a comand with wget.

I hope I'm clear enough for you to understand.
Change the:
Code:
  echo wget -O "$2_img${count}.jpg" $p

to:
Code:
  echo wget -O "$2_img$(printf '%04d' "$count").jpg" $p

and get rid of the echo when you are done debugging.

PS If you tell us what operating system and shell you're using, we might also be able to suggest some shell specific shortcuts to do this. Depending on what shell and (and version of that shell) you're using, there might be shortcuts that would run slightly faster, but would be less portable.

Last edited by Don Cragun; 08-13-2016 at 01:38 PM.. Reason: Add PS.
This User Gave Thanks to Don Cragun For This Post:
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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