10-30-2007
IFS=: makes a colon the default field separator. By grep FIELD1, the code only finds records with the word "FIELD1" in them, probably just one record.
Next, since IFS is a colon, each of the variables in the read statement will be assigned the value of the corresponding field in the file.
LBL1 will be the first field, ie., FIELD1
LBL2 will be the second FEI
and so on.
You now have several variables defined as the contents of the fields in one record from
Param.fle
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)