From d7bcc93a14c1201f3de8e9eb4b07ab33cb8cfd80 Mon Sep 17 00:00:00 2001
From: SinTan1729 <sayantan.santra689@gmail.com>
Date: Fri, 26 Jun 2020 21:17:30 +0530
Subject: [PATCH] Added some error management and "-h" for help

---
 CheckIntegrity | 27 +++++++++++++++++++++++++--
 README.md      |  2 ++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/CheckIntegrity b/CheckIntegrity
index 8aea056..d54e83c 100755
--- a/CheckIntegrity
+++ b/CheckIntegrity
@@ -1,10 +1,33 @@
 #!/bin/sh
 
+# formatting
+bold=$(tput bold)
+normal=$(tput sgr0)
+
+# error function
+error(){
+        printf "The syntax is as follows :\n\n\t${bold}CheckIntegrity algo filename hash${normal}\n\n${bold}algo${normal} is the algorithm to use (e.g. md5, sha1, sha256 etc.)\n${bold}filename${normal} is the relative/full path to file\n${bold}hash${normal} is the given hash to match with\n\n"
+}
+
+# check if asking for help
+if [ $# -eq 1 ] && [ $1 = "-h" ]; then
+    error
+    exit 1
+fi
+
+# check validity of input
+if [ $# -ne 3 ]; then
+    printf "${bold}Input is wrong!${normal}\n\n"
+    error
+    exit -1
+fi
+
+# main code
 f=$1
 f+="sum $2 | cut -d ' ' -f1"
 
 if [ $(eval $f) = "$3" ]; then
-    echo "$2 is fine."
+    echo "$2 is ${bold}fine.${normal}"
 else
-    echo "$2 is corrupted!"
+    echo "$2 is ${bold}corrupted!${normal}"
 fi
diff --git a/README.md b/README.md
index 2a3eb0d..47b20be 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,8 @@ The syntax is as follows :
 
 `hash` is the given hash to match with
 
+You can type `CheckIntegrity -h` for help.
+
 ### _You might buy me a cup of coffee:_
 
 **UPI (preferred) : sayantan.santra@paytm**