BEFORE APPEND

>>Script Language and Platform: Oracle

This script will insert a message into a specific line of multiple files.

I have the following files in a directory.


[[email protected] jp]$ ls -l
total 48
-rwxrwxrwx 1 oracle oinstall 258 Aug 10 22:56 jp1.dat
-rwxrwxrwx 1 oracle oinstall 258 Aug 10 22:56 jp2.dat
-rwxrwxrwx 1 oracle oinstall 258 Aug 10 22:56 jp3.dat
-rwxrwxrwx 1 oracle oinstall 258 Aug 10 22:56 jp4.dat
-rwxrwxrwx 1 oracle oinstall 258 Aug 10 22:57 jp5.dat

I have to include the following message
“THIS SCRIPT BELONGS TO ROAD FARMS COMPANY”
in the third line of each of these files.

The redirection option “>>” can append the line to
the end of a file. Let us see how to insert the message
in the middle of a file.

I checked whether any of my files contain the message.


[[email protected] jp]$ grep “THIS SCRIPT BELONGS TO ROAD FARMS COMPANY” *dat
[[email protected] jp]$

I created a while loop to implement the task of copying
the message in the middle of the files *.dat.


[[email protected] jp]$ cat while_loop.sh
#!/bin/sh -x
#Author JP Vijaykumar Oracle DBA
#Date 08 – 08 – 08
#THIS SCRIPT INSERTS THE FOLLOWING MESSAGE
#IN THE THIRD LINE OF FILES *.DAT
#THIS SCRIPT BELONGS TO ROAD FARMS COMPANY

ls -1 |grep -v while_loop.sh|while read FILE
do
head -2 $FILE >> TEMP
echo “THIS SCRIPT BELONGS TO ROAD FARMS COMPANY” >> TEMP
tail -`cat $FILE|wc -l|awk ‘{print $0 -2}’` $FILE >> TEMP
mv TEMP $FILE
done

exit

I executed the script.


[[email protected] jp]$./while_loop.sh

I checked whether any of my files contain this message.


[[email protected] jp]$ grep “THIS SCRIPT BELONGS TO ROAD FARMS COMPANY” *dat
jp1.dat:THIS SCRIPT BELONGS TO ROAD FARMS COMPANY
jp2.dat:THIS SCRIPT BELONGS TO ROAD FARMS COMPANY
jp3.dat:THIS SCRIPT BELONGS TO ROAD FARMS COMPANY
jp4.dat:THIS SCRIPT BELONGS TO ROAD FARMS COMPANY
jp5.dat:THIS SCRIPT BELONGS TO ROAD FARMS COMPANY

Please test this script thoroughly before implementing.

Author: JP Vijaykumar



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