11-15-2011
Differences in printed commands after execution with same code
I have a korn shell script that executes a function which is stored in a common library. In the function there is obviously some code. Here is the line of code in the function in question:
temp=`echo $status_cnt|tr -d [0-9]`
When the shell script executes with set -x, I'm seeing that on most occasions that the below commands and their arguments are printed as expected based on the above line of code. I'll call this the desired result.
Desired Result
+ + echo 2
+ tr -d [0-9]
However on other, less frequent occasions, I'm seeing the below commands and arguments when the code is executed. I'll call this the undesired result.
Undesired Results
+ + tr -d 2
+ echo 2
Assuming the code in the function is identical on all occasions, what would cause the deviation between the desired and undesired results?
Firstly, why would the 2 commands appear in different order (i.e. shouldn't I always expect the echo to be printed first in the desired result since the echo command precedes the tr -d [0-9] command when being assigned to temp variable)?
Secondly, what would cause the tr -d [0-9] to be printed as tr -d 2?
Thanks in advance!
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LEARN ABOUT DEBIAN
seqdiag
SEQDIAG(1) General Commands Manual SEQDIAG(1)
NAME
seqdiag - generate sequence-diagram image file from spec-text file.
SYNOPSIS
seqdiag [options] file
DESCRIPTION
This manual page documents briefly the seqdiag commands.
seqdiag is generate sequence-diagram image file from spec-text file.
OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is
included below. For a complete description, see the Info files.
--version
show program's version number and exit
-h, --help
show this help message and exit
-a, --antialias
Pass diagram image to anti-alias filter
-c FILE, --config=FILE
read configurations from FILE
-o FILE
write diagram to FILE
-f FONT, --font=FONT
use FONT to draw diagram
-T TYPE
Output diagram as TYPE format
SEE ALSO
The programs are documented fully by
http://tk0miya.bitbucket.org/seqdiag/build/html/index.html
AUTHOR
seqdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>
This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).
May 21, 2011 SEQDIAG(1)