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Top Forums Shell Programming and Scripting Bash script deleting my files, and editing files in subdirectories question Post 302886819 by TheGreatGizmo on Monday 3rd of February 2014 08:05:58 PM
Old 02-03-2014
Sorry, I'm really new to bash. Could someone explain how each part of these code segments work in 3 year old terms? And what the second one does? I like to understand what is going on. These were taken from Neutronscott's reply. Thanks

EDIT: Okay, I see what you did here. Though I'm not sure what the "$0" is for on the end of the printf statement.
Code:
(( $# == 2 )) || {
        printf 'Usage: %s <prefix> <ext>\n' "$0"
        exit 1
}

Code:
shopt -s globstar

Code:
continue # only "regular" files

EDIT: and I understand everything here other than '%s%03d.%s'
Code:
printf -v new '%s%03d.%s' "$prefix" $((number++)) "$type"

Code:
# skip to next file if name conflict
[ -f "$new" ] && continue
[ -x "$file" ] && continue


Last edited by TheGreatGizmo; 02-03-2014 at 10:10 PM..
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list. Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1). FILES
/etc/shells list of shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.11 20 Nov 2007 shells(4)
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