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reading the parameter from another file


 
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# 8  
Old 12-19-2007
Code:
cat file | xargs -n 1 update.ksh 20071912 1

# 9  
Old 12-19-2007
from 'man ksh'
Code:
       < file standard  input  is  redirected  from  file, which is opened for
              reading.

# 10  
Old 12-19-2007
Thanks Vgresh.

But I want to know how $( < ) is decoded to read the file contents? What is the significance of $( here?
cant we just give

for site in /home/sites.txt
do
update.ksh 20071912 1 "${site}"
done
# 11  
Old 12-19-2007
Quote:
Originally Posted by dsravan
Thanks Vgresh.

But I want to know how $( < ) is decoded to read the file contents? What is the significance of $( here?
cant we just give

for site in /home/sites.txt
do
update.ksh 20071912 1 "${site}"
done
no, you cannot have that. The 'for i in <list>' where the list is 'list' of "words". Here's the quote from 'man ksh':
Code:
       for name [ in word ... term ] do list done
              where term is either a newline or a ;.  For  each  word  in  the
              specified  word  list, the parameter name is set to the word and
              list is executed.  If in is not used to specify a word list, the
              positional  parameters ("$1", "$2", etc.) are used instead.  For
              historical reasons, open and close braces may be used instead of
              do  and  done (e.g., for i; { echo $i; }).  The exit status of a
              for statement is the last exit status of list; if list is  never
              executed, the exit status is zero.

# 12  
Old 12-19-2007
'$( command )' is ksh's way to invoke command 'command' in the subshell.
In your case the command is '< filename'. What this does is redirects the content of 'filename' into the stdin of the calling process - your case simply lists the content of the filename as a list of 'words' for the 'for' loop to iterate through.

For example:
Code:
#!/bin/ksh
$ echo 'fred' > foo
$ echo $(<foo)
fred

# 13  
Old 12-20-2007
vgresh,

I made a samll adjustment to the script like below, but was not succesful in creating files for the sites for the day the script is run. can you let me know whats wrong here?

export NEW_DT=`date +%m%d%Y`
export NEW_DT=$1

for site in $(< /path/to/siteFile)
do
update.ksh "${NEW_DT}" 1 "${site}"
done
# 14  
Old 12-20-2007
Quote:
Originally Posted by dsravan
vgresh,

I made a samll adjustment to the script like below, but was not succesful in creating files for the sites for the day the script is run. can you let me know whats wrong here?

export NEW_DT=`date +%m%d%Y`
export NEW_DT=$1

for site in $(< /path/to/siteFile)
do
update.ksh "${NEW_DT}" 1 "${site}"
done
First, pls use vB Codes when posting code and/or quoting something.
Secondly, I don't understand what you're trying to do?
Why are you reassigning NEW_DT twice in a row?
And what is '$1'?

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