02-04-2008
Separate based on file names
Hello experts,
This might prove to be a stupid question to some of you, but I have tried to tackle it in different ways. Being new to shell scripting, I am requesting your help in coming up with an elegant solution. I am using Korn shell.
We have a directory with file names with the pattern:
abc_123
abc_456
xyz_789
I have to compare them against a prefix file to check whether the names behind the underscore are valid and consolidate them in different directories.
How do I do that?
1. Put them in different files and use diff/comm to compare. This requires multiple passes - since the consolidation is more than what I can highlight here.
2. Do something like:
FileList=$(ls -r $SOURCE_DIR) # list & sort
PrefixList=$(cat $PREFIX_FILE | sort -r)
for sFile in $sFileList
do
iDelimit=$(expr index $sFile _)
(( iDelimit -= 1 ))
sFileCmp=$(expr substr $sFile 1 $iDelimit)
for sPrefix in $sPrefixList
do
echo $sFileCmp compared with $sPrefix
if [ $sFileCmp -gt sPrefix ] # will not work, symbolic
then
continue
elif [ $sFileCmp -eq sPrefix ]
then
blPrefixValid=1
else
blPrefixValid=0
break
fi
done
3. Get valid prefixes and run through the directory each time to process files
Any help appreciated.
Thanks.
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LEARN ABOUT SUNOS
readonly
readonly(1) User Commands readonly(1)
NAME
readonly - shell built-in function to protect the value of the given variable from reassignment
SYNOPSIS
sh
readonly [name...]
ksh
**readonly [ name [ = value]...]
**readonly -p
DESCRIPTION
sh
The given names are marked readonly and the values of the these names may not be changed by subsequent assignment. If no arguments are
given, a list of all readonly names is printed.
ksh
The given names are marked readonly and these names cannot be changed by subsequent assignment.
When -p is specified, readonly writes to the standard output the names and values of all read-only variables, in the following format:
"readonly %s=%s
", name, value
if name is set, and:
"readonly $s
", name
if name is unset.
The shell formats the output, including the proper use of quoting, so that it is suitable for reinput to the shell as commands that achieve
the same value and readonly attribute-setting results in a shell execution environment in which:
1. Variables with values set at the time they were output do not have the readonly attribute set.
2. Variables that were unset at the time they were output do not have a value at the time at which the saved output is reinput to the
shell.
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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
ksh(1), sh(1), typeset(1), attributes(5)
SunOS 5.10 17 Jul 2002 readonly(1)