list log files replace particular field

 for i in `ls cdr.30_JUL_2012*`; do perl -e 'while(<>) {@fields=split(/\|/,$_);$fields[5]="hello";for($i=0;$i <= $#fields; $i++){ print "$fields[$i]|";}}' $i > hello.$i; done &

Read line from file1 and search string in other files

IFS='/'; while read line ; do { arr=($line); exp="${arr[1]}${arr[2]}"; tmp=`echo $exp | sed -e 's/"//'`; if [ -z $tmp ]; then continue; fi; len=`expr length $tmp`; if [ $len -gt 30 ]; then grep "${arr[1]}/${arr[2]}" mig_proxy.cdr.26_JUL_2012_mig* | grep -v ${arr[0]}; fi } done < cdr.26_JUL_2012* > report.26_JUL_2012 2>&1


--brief: read line from has delimited by "/" and take third splitted str and search string in other files

Multiply two intergers using bitwise operator

#include<stdio.h>

void main()
{
    int a,b,result;

    printf("Enter the numbers to be multiplied :\n");

    scanf("%d%d",&a,&b);

    result=0;
    while(b != 0)
    {
        if (b&0x01)
        {
            result=result+a;
        }
        a<<=1;
        b>>=1;
    }
    printf("Result:%d",result);
}

List files not accessed for a week

find ./ -atime +30 -type f -exec rm {} \;

@brief:  find the files in current directory whose are not accessed for 30 days and remove the same.


 

get files count and list from all sub directories

#!/bin/bash

DIRS=$(find "$1" -type d)

for d in $DIRS
do
   [ "$d" != "." -a "$d" != ".." ] && echo -e "$d $(ls $d | wc -l)\n$(ls $d)" || :
done

Untar all files in a single directory

---- List all tgz files and untar them and put into specified single directory

for file in `ls -1 mig_proxy.cdr.06_JAN_2012.*`;do tar zxvf $file -C temp/ ; done

 Here temp is where the extracted files will be placed ..

Search and Replace in awk

ls -R | gawk '{if($1 ~ /.*:$/){split($1,a,"/");if(a[length(a)] ~ /[a-z]/){if(length($1) > 10){print $1;}}}}' | awk '{ sub(/[:]$/, ""); print }' | xargs rm -rf