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Full Discussion: Use of regular expression
Operating Systems Linux Fedora Use of regular expression Post 302927946 by Don Cragun on Sunday 7th of December 2014 08:30:07 PM
Old 12-07-2014
I don't understand why you were using -F: in your awk scripts when there aren't any colons in your filenames. Here are a couple of ways to do it; one using ls, awk, rm, and bash; and the other one just using bash and rm. Both are presented in readable format and in 1-liner format:
Code:
#!/bin/bash
echo 'ls | awk | bash:'
ls | awk '
/[0-9][.]dok$/ {
	match($0, "[0-9]*[.]dok$")
	printf("echo mv \"%s\" \"%s%s.doc\"\n", $0, substr($0, 1, RSTART-1),
		substr($0, RSTART, length($0) - RSTART - 3) + 1)
}' | bash
printf '\n\nbash/ksh built-ins:\n'
for f in *[0-9].dok
do	b=${f%.dok}
	s=${b##*[!0-9]}
	b=${b%%[[0-9]*}
	echo mv "$f" "$b$((s+1)).doc"
done
printf '\n\nls | awk | bash 1-liner:\n'
ls|awk '/[0-9][.]dok$/{match($0,"[0-9]*[.]dok$");printf("echo mv \"%s\" \"%s%s.doc\"\n",$0,substr($0,1,RSTART-1),substr($0,RSTART,length($0)-RSTART-3)+1)}'|bash
printf '\n\nbash/ksh built-ins 1-liner:\n'
for f in *[0-9].dok;do	b=${f%.dok};s=${b##*[!0-9]};b=${b%%[[0-9]*};echo mv "$f" "$b$((s+1)).doc";done

If you find one that prints the mv commands you want to execute, remove the echo shown in red to actually rename the files.

The parameter expansion extracting the sequence number from the pathname works as long as there is only one string of digits in the filenames being processed (just before the .dok). The ERE in the awk script doesn't have this limitation, but your description didn't indicate that there could be multiple strings of digits; so I assume both methods do what you need.

Neither of these will do what you want if there are leading zeros on the digit strings in your filenames (such as value0012.dok).
 

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LEARN ABOUT PLAN9

regexp

REGEXP(6)							   Games Manual 							 REGEXP(6)

NAME

       regexp - regular expression notation

DESCRIPTION

       A  regular  expression  specifies  a  set  of  strings of characters.  A member of this set of strings is said to be matched by the regular
       expression.  In many applications a delimiter character, commonly bounds a regular expression.  In the following specification for  regular
       expressions the word `character' means any character (rune) but newline.

       The syntax for a regular expression e0 is

	      e3:  literal | charclass | '.' | '^' | '$' | '(' e0 ')'

	      e2:  e3
		|  e2 REP

	      REP: '*' | '+' | '?'

	      e1:  e2
		|  e1 e2

	      e0:  e1
		|  e0 '|' e1

       A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by

       A  charclass  is  a  nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s.  A negated character class never
       matches newline.  A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and  b.   In	s,
       the  metacharacters  an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and
       may appear unescaped.

       A matches any character.

       A matches the beginning of a line; matches the end of the line.

       The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2.

       A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2.

       An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1.

       A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the  regular  expres-
       sion.

SEE ALSO

       awk(1), ed(1), sam(1), sed(1), regexp(2)

																	 REGEXP(6)
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