some improvment to the sheel tools

Author: RahwaZeslusHaile

individual-shell-tools/ls/script-02.sh

@@ -4,5 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command which lists all of the files in the directory named child-directory.
 # The output should be a list of names: helper-1.txt, helper-2.txt, helper-3.txt.
-
-ls child-directory
+ls "child-directory"

individual-shell-tools/ls/script-03.sh

@@ -5,5 +5,4 @@ set -euo pipefail
 # TODO: Write a command which _recursively_ lists all of the files and folders in this directory _and_ all of the files inside those folders.
 # The output should be a list of names including: child-directory, script-01.sh, helper-1.txt (and more).
 # The formatting of the output doesn't matter.
-
 ls -R

individual-shell-tools/ls/script-04.sh

@@ -15,13 +15,10 @@ echo "First exercise (sorted newest to oldest):"
 
 # TODO: Write a command which lists the files in the child-directory directory, one per line, sorted so that the most recently modified file is first.
 # The output should be a list of names in this order, one per line: helper-3.txt, helper-1.txt, helper-2.txt.
-
-ls -t child-directory
+ls -1t child-directory
 
 echo "Second exercise (sorted oldest to newest):"
 
 # TODO: Write a command which does the same as above, but sorted in the opposite order (oldest first).
 # The output should be a list of names in this order, one per line: helper-2.txt, helper-1.txt, helper-3.txt.
-
-
-ls -tr child-directory  
+ls -1tr child-directory  

individual-shell-tools/sed/script-05.sh

@@ -6,5 +6,4 @@ set -euo pipefail
 # If a line starts with a number and a space, make the line instead end with a space and the number.
 # So line 6 which currently reads "37 Alisha" should instead read "Alisha 37".
 # The output should contain 11 lines.
-
-sed -E 's/^([0-9]+) (.+)/\2 \1/' input.txt
+sed -E "s/^[[:space:]]*([0-9]+)[[:space:]]+(.*)$/\2 \1/" input.txt

individual-shell-tools/wc/script-02.sh

@@ -4,5 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the number of lines in the file helper-files/helper-3.txt.
 # The output should include the number 3. The output should not include the number 19.
-
-wc -l < ../helper-files/helper-3.txt
+wc -l ../helper-files/helper-3.txt