Regular expression for file and directory listing
I guess ls is a laudable command in the Linux world – the fact that everything is a file, we exploit it in a daily manner.
One usage of the a helpful command on ls is grep for listing regex’d listing.
here is the the simplest command that can list all the files/directories with that start with ‘pe’
First we would be on the directory we want the listing, then we would pipe the listing to grep!
ls | grep "^pe.*"
Even
ls | grep "^pe"
would result the same.
One that contains pe would be
ls | grep "pe"
and the one that ends with pe would be
ls | grep "pe$"
Further reading Ubunutu help on grep
See how you would solve these known algorithm problems
Finding missing numbers from billion sequential number list fileCheck if there are three numbers a, b, c giving a total T from array A
Array reversal in Recurrsion
Get maximum occurring character
Changing decimal number to its binary equivalent
Implement Queue Using two Stacks – JavaScript algorithm
String Ordered Permutation Algorithm Problem
Find longest palindrom from sequence of characters
find longest word in the sentence
Find the pairs that makes K Complementary in the given array java solution