08-16-2007
Perdarabo,
Quote:
Originally Posted by Perderabo
or change the line
exec < data
to
exec < testingdata.txt
or change it to:
exec < $1
and then pass the name of file as an argument
or eliminate the line entirely and redirect the input
Ok I got it,but when i ran the script with the changed name of the input file it gave me an error
./script
./script[82]: item: bad number
The change i did in the script is only this
exec < testingdata
The requiremnt is a bot diffrent,i am mentioning the points for you..
# scan the 27 data items to make sure they are numbers
# and remove leading zeros while we are at it
This req is like this---
1... We are not bothered about the leading zeroes ie 01,02,03-------------- In my requirement they all are valid numbers,we should ignore the zeroes only ie 00 where ever they are,they are just for filling purpose dont have any meaning.
2..# note each column with a non-zero--
here leading zero is fine ie 01,02,03----- they are fine.Here i need to check that the colums must have a valid number and if more than that numbers are there then it should be in ascending order,if not the data is ascending order in column it should print that data as an error.
3. There should be 27 entries in a row that is fine but in that there must be exactly 15 numbers leaving all 00.
4. When i ran the script in debug mode that is ksh -x script
it tells--
ksh -x script
ksh: script: cannot execute
I am using solaris machine.
Your apporoach to the requirement is very correct but just some changes.Rest of the code is fullfilling the requirement.I am new to shell script.
Thanks
Namish
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exec(1) User Commands exec(1)
NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 17 Jul 2002 exec(1)