unix ksh: script to read input from file
Dear Experts,
Say I have a script (process.ksh) like this:
echo $1 >> test.txt
echo $2 >> test.txt
echo $3 >> test.txt
Those varialbes are stored in another file (data.txt) like this:
1=workstation
2=stream
3=job
What command do I need for process.ksh to read data.txt and execute the cmd's
I tried
`cat data.txt ` | process.ksh
process.ksh `cat data.txt`
but all it produces is test.txt with empty lines
Thanks in advance.
Say I have a script (process.ksh) like this:
echo $1 >> test.txt
echo $2 >> test.txt
echo $3 >> test.txt
Those varialbes are stored in another file (data.txt) like this:
1=workstation
2=stream
3=job
What command do I need for process.ksh to read data.txt and execute the cmd's
I tried
`cat data.txt ` | process.ksh
process.ksh `cat data.txt`
but all it produces is test.txt with empty lines
Thanks in advance.
Last Comment
Er,
after copying and pasting I saw that the first metacharacter is not a backtick but a sharp accent ( ´ ) which is wrong. You need two backticks!
So I'd really suggest using the $( ... ) notation!
after copying and pasting I saw that the first metacharacter is not a backtick but a sharp accent ( ´ ) which is wrong. You need two backticks!
So I'd really suggest using the $( ... ) notation!
ASKER
Same result: empty lines in test.txt....
# cat data.txt
wks=HT0016P
stream=JOBS
job=OTS-EXIT1-CMD
# cat process.ksh
echo $wks >> /opt/maestro/OTS/SCRIPTS/T
echo $stream >> /opt/maestro/OTS/SCRIPTS/T
echo $job >> /opt/maestro/OTS/SCRIPTS/T
# cat test.txt
#
When -x this is returned...
# ksh -x process.ksh $(cat data.txt)
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
# cat data.txt
wks=HT0016P
stream=JOBS
job=OTS-EXIT1-CMD
# cat process.ksh
echo $wks >> /opt/maestro/OTS/SCRIPTS/T
echo $stream >> /opt/maestro/OTS/SCRIPTS/T
echo $job >> /opt/maestro/OTS/SCRIPTS/T
# cat test.txt
#
When -x this is returned...
# ksh -x process.ksh $(cat data.txt)
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
+ echo
+ 1>> /opt/maestro/OTS/SCRIPTS/T
OK,
that's quite a different thing!
In your Q you wrote "echo $1" ..., now you're writing "echo $wks" ... !
What dou you want to appear in test.txt? Only the strings "HT0016P" etc. or also the "wks=" etc. stuff?
In the latter case you could actually use $1, $2, $3 ... in process.ksh.
For the second case - do you actually need the variables $wks etc for a later use?
If not, you could simply do in process.ksh
while read line ; do echo ${line#*=} >> /opt/maestro/OTS/SCRIPTS/T
and run process.ksh like this
process.ksh < data.txt
wmp
that's quite a different thing!
In your Q you wrote "echo $1" ..., now you're writing "echo $wks" ... !
What dou you want to appear in test.txt? Only the strings "HT0016P" etc. or also the "wks=" etc. stuff?
In the latter case you could actually use $1, $2, $3 ... in process.ksh.
For the second case - do you actually need the variables $wks etc for a later use?
If not, you could simply do in process.ksh
while read line ; do echo ${line#*=} >> /opt/maestro/OTS/SCRIPTS/T
and run process.ksh like this
process.ksh < data.txt
wmp
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ASKER
I thought that the name of the variable didn't matter, so that a $1 would be equivalent to $wks ...
The whole idea here is that there is a process that can produce a data.txt file, and is able to start a script. That script executes cmds using the values in data.txt in order to produce yet other files to finally xmail the result..
So to re-use the script, that would have just the variables in it, but the input file (data.txt) would be different each time and hold the values.
So process.ksh would use cmds in which HT0016p and JOBS and OTS-EXIT1-CMD are used.
Hope this clarifies.
W.
The whole idea here is that there is a process that can produce a data.txt file, and is able to start a script. That script executes cmds using the values in data.txt in order to produce yet other files to finally xmail the result..
So to re-use the script, that would have just the variables in it, but the input file (data.txt) would be different each time and hold the values.
So process.ksh would use cmds in which HT0016p and JOBS and OTS-EXIT1-CMD are used.
Hope this clarifies.
W.
ASKER
That does it wnp, many thanks!
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Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.
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process.ksh ´cat data.txt`
should work!
The shell will expand this statement to
process.ksh 1=workstation 2=stream 3=job
so that process.ksh will recognize "1=workstation" as $1 , "2=stream" as $2 etc. (positional parameters).
Did you actually use backticks`I think you should try
process.ksh $(cat data.txt)
It's better readable and there is no risk of confusing backticks with apostrophes.
wmp