Bash programming.

Manipulation of number

total=`expr ${total} + ${pathsize}

let sum=0
let sum=$sum+$num

Testing Using While loop.

#!/bin/bash
COUNT=6
# bash while loop
while [ $COUNT -gt 0 ]; do
 echo Value of count is: $COUNT
 let COUNT=COUNT-1
done

Calculating the Date Modified

Sample Code:

CUR_DATE=$(date +"%s");
for JOB_FILE in [0-9]*; do
  MOD_FILE_DATE=$(stat -c "%Y" $JOB_FILE)
  echo -e "$JOB_FILE\t$CUR_DATE\t$MOD_FILE_DATE"
done

Or 

if [ "$(( $(date +"%s") - $(stat -c "%Y" $somefile) ))" -gt "7200" ]; then
   echo "$somefile is older then 2 hours"
fi

VIM Command

http://www.yolinux.com/TUTORIALS/LinuxTutorialAdvanced_vi.html

Encoding String using BASH

OUTPUT=$(php -r "echo rawurlencode('$(sed "s/'/\\\\'/g" <<< "$OUTPUT")');")

Getting Absolute File Path

Originally FROM: how-to-get-the-absolute-path-within-the-running-bash-scrip

# Absolute path to this script. /home/user/bin/foo.sh
SCRIPT=$(readlink -f $0)
# Absolute path this script is in. /home/user/bin
SCRIPTPATH=`dirname $SCRIPT`

Multi di-mentional ARRAY

#!/bin/bash  
A=("abcd" "dcba")  
Z=("zxyw" "wxyu" "tuxz")  
ARR=(A Z)  
  
for ROW in ${ARR[*]}  
do  
    echo "processing row: $ROW"  
    TEMP="\${$ROW[*]}"  
    ROW=`eval echo $TEMP`  
    for ELEMENT in $ROW  
    do  
        echo "  processing element: $ELEMENT"  
    done  
done  

Original Post:bash-multidimensional-array

Bash : converting unix timestamp to date

converting unix timestamp to date