feat: completing ls| grep exercises.

Author: jamallaqdiem

shell-pipelines/ls-grep/script-01.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name contains at least one upper case letter.
 # Your output should contain 11 files.
+ls -1 sample-files | grep '[A-Z]'

shell-pipelines/ls-grep/script-02.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter.
 # Your output should contain 10 files.
+ls -1 sample-files | grep  '^[A-Z]'

shell-pipelines/ls-grep/script-03.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should contain 7 files.
+ls -1 sample-files | grep '^[A-Z][a-z]*$'

shell-pipelines/ls-grep/script-04.sh

@@ -4,3 +4,6 @@ set -euo pipefail
 
 # TODO: Write a command to count the number of files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should be the number 7.
+#!/bin/bash
+
+ls -1 sample-files | grep '^[A-Z][a-z]*$' | wc -l