System Software Lab Programs ( UNIX Programs ) – 3a

// March 8th, 2009 // Engineering, Unix and System Software Lab // Written by Sandeep Hegde

Subject : System Software Laboratory

Branch : Information Science & Engineering

Semester : 6

University : VTU

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PART -B

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3.a) Shell function that takes a valid directory names as an argument an recursively descends all the sub directories, finds the maximum length of any file in that hierarchy and writes this maximum value to the standard output.

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clear

find

{

clear tput

echo -e “Enter a valid directory name : ”

read dir

if [  -d @dir ]

then

ls -1R $dir>file1

grep -h “^-r” file1>file2

cat file2

cut -c 24-28 file2>file3

sort -n file3>file4

tail -1 file4>file5

echo -e “Max length is ”

cat file5

else

else

echo -e “Invalid dir ”

fi

}

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