Re: Tiny shell script to chase symbolic links to true file name
I'd like to thank Jake for his post, even though I haven't tried it yet.
I would also like to throw this out for anyone that can use it --
With having inherited a diverse Informix environment, I have had to battle
with trying to find out how things were
placed on disk, whether we were using raw -vs- blocked, links, etc...
So I created the following script which gens a report of the chunk names to
link, and whether it is raw / block.
Just have your env set for your engine and run it.
Hope some of you will find it useful - If you can make it better, please
let me know. I'm always looking for better ways to do things.
Sincerely -
Eric P. Melillo
Sr. Database Administrator
Associated Grocers, Inc.
Seattle, WA 98118
vmail: (206) 767-8178
email: eric_melillo@agsea.com
#========== SCRIPT BEGINS HERE ===========
#!/bin/ksh
#
# SCRIPT NAME : inf_disk
#
# WRITTEN BY : Eric P. Melillo
# DATE WRITTEN: 10 OCT 1997
#
# PURPOSE : To document the disk(s) utilized by informix,
# : - lists the chunks that exist
# : - what the links are ( if any )
# : - type of disk used (raw -vs- block).
#
# NOTES : Works with both version 5.X and 7.X
# : run it once for each Informix server(s)
SVRNAME=`hostname`
# Determine Engine Version
if [ -x $INFORMIXDIR/bin/onstat ]
then
STAT="onstat"
ENGINE=`env | grep ONCONFIG`
else
STAT="tbstat"
ENGINE=`env | grep TBCONFIG`
fi
# Get chunk information
$STAT -d |
sed '1,5d' |
awk 'BEGIN {i=0}
{
if ($1 == "Chunks")
{i=1}
if (i==1 && $1 != "address" && NF == 8)
{printf("%s %s %s \\n", $5,$7,$8)}
}' > /tmp/inf_c.$$
# Get chunk-path information
for CPATH in `cat /tmp/inf_c.$$ | awk '{ print $3 }'`
do
ls -al $CPATH | \\
awk 'BEGIN {i=0}
{
if (i==0 && NF == 11)
{
#
# The following "if" stmt handles the case where someone created
# a symbolic link in the same directory as the device driver and
# did not full path the darn thing...
#
if ( substr($11,2,2) !~ /de/ )
{
split($9,dirarray,"\\/")
printf ("%s %s /%s/%s/%s\\n",$9,$10,dirarray[2],dirarray[3],$11)
}
else
printf ("%s %s %s\\n",$9,$10,$11)
}
if (i==0 && NF == 10)
{printf ("%s %s %s\\n","fld9","fld10",$10)}
}' >> /tmp/inf_l.$$
# Get link-path information
for LPATH in `cat /tmp/inf_l.$$ | awk '{ print $3 }'`
do
ls -al $LPATH | \\
awk 'BEGIN {i=0}
{
if (i==0)
{printf ("%s %s\\n",$1,$10)}
}' >> /tmp/inf_d.$$
done
DEVPERM=`grep $LPATH /tmp/inf_d.$$ | \\
awk -v lpath=$LPATH '{if($10=lpath) {print $1}}'`
echo "$CPATH -> $LPATH $DEVPERM" >> /tmp/inf_r.$$
done
echo "SERVER = $SVRNAME" >> /tmp/$SVRNAME.DBSPACE.RPT
echo $ENGINE >> /tmp/$SVRNAME.DBSPACE.RPT
echo "\\n\\n\\n" >> /tmp/$SVRNAME.DBSPACE.RPT
cat /tmp/inf_r.$$ |
awk '{printf ("%-40s %-4s %-28s %3s\\n", $1,$2,$3,substr($4,1,1))}' >>
/tmp/$SVRNAME.DBSPACE.RPT
pr -l60 /tmp/$SVRNAME.DBSPACE.RPT | lp
rm /tmp/inf_c.$$
rm /tmp/inf_l.$$
rm /tmp/inf_d.$$
rm /tmp/inf_r.$$
rm /tmp/$SVRNAME.DBSPACE.RPT
#========== SCRIPT ENDS HERE ===========
Hi all.
I wrote this shell script to ease some aspects of Informix
administration. I am cross posting it because it has general use. Here
it is:
---------------------------- CUT HERE ----------------------------------
#!/bin/ksh
# truename - chase down theain of symbolic links to obtain the true
# name of a file
# Parameters: Name of a file or a list of file names
#
# Author: Jacob Salomon
# jake@garpac.com
# Date: August 12 1998
# Shell function chase1 - Chase 1 file name to its true name
# Parameter: The file name
chase1 ()
{
PFN=$1
# Get link name, if any. If there is no symbolic link, the loop
# below will not need to start.
#
ls -ld $PFN | awk '{print $NF}' | read link_name
until [ "$link_name" = "$PFN" ] # chase it until no further links
do
PFN=$link_name # Reset for next round of loop
ls -ld $PFN | awk '{print $NF}'|read link_name
done
echo $link_name
}
for FN in $*
do
chase1 $FN | read TN # Get any name this file might link to
# echo $FN : $TN
echo $TNdone
---------------------------- CUT HERE ----------------------------------
--
-- Jake (Retrospectively realizes there is no future in hindsight)
+------------------------------------------------------------+
| The expedient performance of a task with excessive concern |
| regarding its duration-to-completion engenders a virtual |
| certainty of diminished benefit therefrom. |
| -- Benjamin Franklin (but he said it in 3 words) |
+------------------------------------------------------------+