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Full Discussion: Update a field in a file based on condition
Top Forums Shell Programming and Scripting Update a field in a file based on condition Post 302478049 by kichu on Tuesday 7th of December 2010 04:14:20 AM
Old 12-07-2010
Update a field in a file based on condition
Hi

i am new to scripting. i have a file file.dat with content as :

Code:
 
CONTENT_STORAGE PERCENTAGE FLAG:
/storage_01 64% 0
/storage_02 17% 1

I need to update the value of FLAG for a particular CONTENT_STORAGE value

I have written the following code
Code:
 
 #!/bin/sh
threshold=20
alert="threshold"
#Get default file store 
defaultStorage1=DEFAULT_STORE 
#DEFAULT_STORE is obtained as storage_01 from database table
 
echo "file reading"
{
 
while read CONTENT_STORAGE PERCENTAGE FLAG
do
 
    #Code for reading through lines and ignoring all until CONTENT_STORAGE is found
 
    # Ignore all lines until content storage namematches the name given 
    if [[ ${CONTENT_STORAGE} != $defaultStorage1 ]]; then
 echo "here"
        continue
    fi   
echo "CONTENT_STORAGE = ${CONTENT_STORAGE} / PERCENTAGE = ${PERCENTAGE} / FLAG = ${FLAG}" 
done < file.dat 
}
echo "Getting the percentage og $defaultStorage1 *********************"
#check the percentage stored in defaultStorage
df -H | grep $defaultStorage1 | awk '{ print $4 " " $5}' | while read output;
do 
  #Get the used percentage
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1)
 echo "used percentage .................. $usep"
# Check if the used percentage is > threshold_value. Do nothing till its > threshold
   if [ $(($usep)) -le $(($threshold)) ]; then
 echo "Used percentage of $defaultStorage1 ................. $(($usep))"
       continue
 
else 
 
echo "Used percentage is greater than threshold"
 
    # Ignore all lines until content storage namematches the name given 
    if [[ ${CONTENT_STORAGE} != $defaultStorage1 ]]; then
        continue
    else
       $FLAG = 1  
#i am trying to update the FLAG field in here. But not happening. Also while creating the tmp file file.mp and rewriting to file.dat, the headings are ignored. i want to just modify the FLAG value for /storage1 to 1
    fi 
    echo $CONTENT_STORAGE $PERCENTAGE $FLAG >> file.tmp
  done < file.dat  
mv file.tmp file.dat
   # check the percentage of each other filestore with flag =0
   #get the least used filestore
   #update the default store
 
   fi
 
done

Thanks for all the help in advance
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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