Shell Programming and Scripting

# cat /tmp/tarfiles/script.sh
 
#!/bin/sh
cd /tmp/tarfiles/
TFL="tar_files_list.txt"
TCF="tar_completed_list.txt"
ls -l *.tar | awk '{print $9}' > $TFL
for i in `cat $TFL`
do
 if [ -s $TCF ]
   then
    for j in `cat $TCF`
     do
        if [ "$i" = "$j" ]
           then
              echo " "
           else
             tar -xvf $i
        fi
     done
  else
     tar -xvf $i
 fi
done
cp tar_files_list.txt tar_completed_list.txt

i - j
1 = 1
2 = 2
3 = 3
4 = 4

i - j
1 = 1
1 = 2
1 = 3
1 = 4
2 = 1
2 = 2
2 = 3
2 = 4

#!/bin/sh
cd /tmp/tarfiles
TFL="$(ls *.tar)"
TCF="tar_completed_list.txt"
touch "$TCF"
for i in $TFL; do
   if ! grep -q "$i" $TCF; then
      tar -xf $i
   fi
done
printf "%s\n" $TFL > $TCF