12-29-2011
abc@abc$ sh -x demo.ksh 2 6 7 8 11 12 18 25 26 27
prevval=2
+ shift
seqflag=N
+ expr 2 + 1
nextval=3
+ echo $nextval=3
$nextval=3
+ [ 6 -eq 3 ]
+ [ N = N ]
output=,2
prevval=6
+ expr 6 + 1
nextval=7
+ echo $nextval=7
$nextval=7
+ [ 7 -eq 7 ]
+ [ N = N ]
seqflag=Y
seqstart=6
prevval=7
+ expr 7 + 1
nextval=8
+ echo $nextval=8
$nextval=8
+ [ 8 -eq 8 ]
+ [ Y = N ]
prevval=8
+ expr 8 + 1
nextval=9
+ echo $nextval=9
$nextval=9
+ [ 11 -eq 9 ]
+ [ Y = N ]
seqflag=N
output=,2,6-8
prevval=11
+ expr 11 + 1
nextval=12
+ echo $nextval=12
$nextval=12
+ [ 12 -eq 12 ]
+ [ N = N ]
seqflag=Y
seqstart=11
prevval=12
+ expr 12 + 1
nextval=13
+ echo $nextval=13
$nextval=13
+ [ 18 -eq 13 ]
+ [ Y = N ]
seqflag=N
output=,2,6-8,11-12
prevval=18
+ expr 18 + 1
nextval=19
+ echo $nextval=19
$nextval=19
+ [ 25 -eq 19 ]
+ [ N = N ]
output=,2,6-8,11-12,18
prevval=25
+ expr 25 + 1
nextval=26
+ echo $nextval=26
$nextval=26
+ [ 26 -eq 26 ]
+ [ N = N ]
seqflag=Y
seqstart=25
prevval=26
+ expr 26 + 1
nextval=27
+ echo $nextval=27
$nextval=27
+ [ 27 -eq 27 ]
+ [ Y = N ]
prevval=27
+ [ Y = N ]
output=,2,6-8,11-12,18,25-27
demo.ksh: bad substitution
abc@abc$
---------- Post updated at 06:32 PM ---------- Previous update was at 06:31 PM ----------
i had make the correction as below
nextval=`expr $prevval + 1`
echo "\$nextval=$nextval"
but still getting error, you can see on above my post.
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echo(1B) SunOS/BSD Compatibility Package Commands echo(1B)
NAME
echo - echo arguments to standard output
SYNOPSIS
/usr/ucb/echo [-n] [argument]
DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output.
echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi-
ronment variables.
For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows:
o echo your current-working-directory's full pathname
o pipe the output through tr to translate the path's embedded slash-characters into space-characters
o pipe that output through wc -w for a count of the names in your path.
example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w"
See tr(1) and wc(1) for their functionality.
The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if
the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape
characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's
echo() also understands a as the audible bell character; however, these commands do not have an -n option.
OPTIONS
-n Do not add the NEWLINE to the output.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5)
NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases.
SunOS 5.10 3 Aug 1994 echo(1B)