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Top Forums Shell Programming and Scripting To check the missing file based on sequence number. Post 302971623 by Don Cragun on Friday 22nd of April 2016 02:30:44 PM
Old 04-22-2016
You might also try the following ksh script that just uses shell built-ins (so it runs a little faster than andy391791's script). And, unlike andy391791's script, it also adds some error checking code and will work with any shell that performs basic parameter expansions required by the POSIX standards instead of just working with a Korn shell. And, unlike looney's bash script, it will report missing files from the lowest numbered existing file with a name matching FILE_[0-9][0-9][0-9].txt to the highest numbered existing file with a name matching that pattern instead of just looking for missing files in the range 001 through 014.
Code:
#!/bin/ksh
first=1
missing=0

nextfile() {
	seq=$((seq + 1))
	next=$(printf 'FILE_%03d.txt' "$seq")
}

for i in FILE_[0-9][0-9][0-9].txt
do	if [ "$first" = 1 ]
	then	if [ ! -f "$i" ]
		then	printf 'No files matching pattern found.\n' >&2
			exit 1
		fi
		seq=${i#FILE_}
		seq=${seq#0}	# Avoid problems with some shells treating
		seq=${seq#0}	# numbers with leading zeros as octal.
		seq=${seq%.txt}
		first=
		continue
	fi
	nextfile
	while [ "$next" != "$i" ]
	do	printf '%s is missing\n' "$next"
		missing=$((missing + 1))
		nextfile
	done
done
if [ "$missing" = 0 ]
then	printf 'No missing files detected.\n'
fi

 

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SEQ(1)							    BSD General Commands Manual 						    SEQ(1)

NAME
seq -- print sequences of numbers SYNOPSIS
seq [-w] [-f format] [-s string] [-t string] [first [incr]] last DESCRIPTION
The seq utility prints a sequence of numbers, one per line (default), from first (default 1), to near last as possible, in increments of incr (default 1). When first is larger than last the default incr is -1. All numbers are interpreted as floating point. Normally integer values are printed as decimal integers. The seq utility accepts the following options: -f format Use a printf(3) style format to print each number. Only the E, e, f, G, g, and % conversion characters are valid, along with any optional flags and an optional numeric minimum field width or precision. The format can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is %g. -s string Use string to separate numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is . -t string Use string to terminate sequence of numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). This option is useful when the default separator does not contain a . -w Equalize the widths of all numbers by padding with zeros as necessary. This option has no effect with the -f option. If any sequence numbers will be printed in exponential notation, the default conversion is changed to %e. The seq utility exits 0 on success and non-zero if an error occurs. EXAMPLES
# seq 1 3 1 2 3 # seq 3 1 3 2 1 # seq -w 0 .05 .1 0.00 0.05 0.10 SEE ALSO
jot(1), printf(1), printf(3) HISTORY
The seq command first appeared in Plan 9 from Bell Labs. A seq command appeared in NetBSD 3.0, and ported to FreeBSD 9.0. This command was based on the command of the same name in Plan 9 from Bell Labs and the GNU core utilities. The GNU seq command first appeared in the 1.13 shell utilities release. BUGS
The -w option does not handle the transition from pure floating point to exponent representation very well. The seq command is not bug for bug compatible with the Plan 9 from Bell Labs or GNU versions of seq. BSD
February 19, 2010 BSD
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