completed sort,uniq,head,tail exercise; completed tr command exercise

Author: ike-agu

shell-pipelines/tr/script-01.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # The author got feedback that they're using too many exclamation marks (!).
 #
 # TODO: Write a command to output the contents of text.txt with every exclamation mark (!) replaced with a full-stop (.).
+
+ cat text.txt | tr "!" "."

shell-pipelines/tr/script-02.sh

@@ -7,3 +7,5 @@ set -euo pipefail
 # so every Y should be a Z, and every Z should be a Y!
 #
 # TODO: Write a command to output the contents of text.txt with every Y and Z swapped (both upper and lower case).
+
+cat text.txt | tr "yYzZ" "zZyY"

shell-pipelines/tr/text.txt

@@ -2,7 +2,7 @@ Dear Yara,
 
 Mz apologies for sending this response so late. As zou know, there's been a lot going on!
 
-Unfortunatelz I don't think I'll be able to make it to Yimbabwe, but but sounds amaying!
+Unfortunatelz I don't think I'll be able to make it to Yimbabwe, but sounds amaying!
 
 Hope zou're doing well, and enjoz the trip!