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Full Discussion: If Then ElseIf Script - Confusion Around Expression's Syntax
Top Forums UNIX for Dummies Questions & Answers If Then ElseIf Script - Confusion Around Expression's Syntax Post 302554892 by gary_w on Tuesday 13th of September 2011 09:46:36 AM
Old 09-13-2011
Here's one way, that while may not be the slickest, breaks down the issue into logical parts that you are testing for and may be useful for understanding:
Code:
#!/bin/ksh

FILE=test.csv  # Path to file to test.

if [[ -s $FILE ]]; then  # If it exists and has size...
   ##  See if the 1st line starts with the header string
   ##  Throw away the output and test for the return code
   head -1 $FILE | grep '^Tick_Num,Line_No' >/dev/null 2>&1
   if (( $? == 0 )); then
     print "$0: Found a header in the first row"
   else
     print "$0: $FILE does not have a header row"
     exit 1
   fi
else
  print "$0: $FILE does not exist or has no size"
  exit 2
fi

exit 0

Last edited by gary_w; 09-13-2011 at 10:49 AM.. Reason: I see your requirements changed from the original post, so this example is no longer valid.
 

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WC(1)									FSF								     WC(1)

NAME

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SYNOPSIS

       wc [OPTION]... [FILE]...

DESCRIPTION

       Print  byte, word, and newline counts for each FILE, and a total line if more than one FILE is specified.  With no FILE, or when FILE is -,
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       -c, --bytes
	      print the byte counts

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	      print the character counts

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	      print the newline counts

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	      print the length of the longest line

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