Snippets

Jesse Almanrode Bash Snippets

Updated by Jesse Almanrode
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File verify-ipv4.bsh Modified

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 #!/bin/bash
-function VERIFY_IP() {
+function VERIFY_IPv4() {
 ip=$1;
 isIP=S(echo "$ip" | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}');
 if [ -z "$isIP" ]; then
Updated by Jesse Almanrode
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File psudo-array.bsh Modified

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 #!/bin/bash
 # Use echo to turn the string variable into a pseudo array
-echo "$pseudoArray” | while read line; do
-    echo "$line”;
+echo "${pseudoArray}” | while read line; do
+    echo "${line}”;
     echo "----"; # To show I am processing each line in turn
 done

File root-test.bsh Modified

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 #!/bin/bash
 MY_UID=$(id | grep 'uid=0(root)'); # Running as root or using sudo
-if [ -n “MY_UID” ]; then
+if [ -n ${MY_UID} ]; then
 	echo “You must run this tool as your normal user and not using sudo”;
 	exit 1;
 else

File try-statement.bsh Modified

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 #!/bin/bash
 someCommand 2> /dev/null; 
 # Do the command but don’t show an error to the user if one occurs
-if [ “$?” -ne 0 ]; then
+if [ $? -ne 0 ]; then
 	echo “An Error Occurred”;
 	# Do something about it
 fi
 
 someCommand; 
 # Show the error to the user, if any, and then do something about it
-if [ “$?” -ne 0 ]; then
+if [ $? -ne 0 ]; then
 	echo “An Error Occurred”;
 	# Do something about it
 fi
Updated by Jesse Almanrode
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File root-test.bsh Modified

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-#/bin/bash
+#!/bin/bash
 MY_UID=$(id | grep 'uid=0(root)'); # Running as root or using sudo
 if [ -n “MY_UID” ]; then
 	echo “You must run this tool as your normal user and not using sudo”;
Updated by Jesse Almanrode
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File root-test.bsh Modified

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 #/bin/bash
-MY_UID=`id | grep ‘uid=0(root)’; # Running as root or using sudo
+MY_UID=$(id | grep 'uid=0(root)'); # Running as root or using sudo
 if [ -n “MY_UID” ]; then
 	echo “You must run this tool as your normal user and not using sudo”;
 	exit 1;

File verify-ipv4.bsh Modified

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 #!/bin/bash
 function VERIFY_IP() {
 ip=$1;
-isIP=`echo "$ip" | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'`;
+isIP=S(echo "$ip" | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}');
 if [ -z "$isIP" ]; then
         echo "Not in IP form: $ip";
         return 1;
 fi
-ipArray=`echo $ip | tr '.' ' '`;
-firstOctet=`echo $ip | cut -d '.' -f1`;
-lastOctet=`echo $ip | cut -d '.' -f4`;
+ipArray=$(echo $ip | tr '.' ' ');
+firstOctet=$(echo $ip | cut -d '.' -f1);
+lastOctet=$(echo $ip | cut -d '.' -f4);
 newip="";
 for octet in $ipArray; do
-        octet=`echo $(( ${octet#0} ))`;
+        octet=$(echo $(( ${octet#0} )));
         if [ $octet -gt 255 ]; then
                 echo "Invalid IP: $ip";
                 return 1;
                 newip="$newip$octet.";
         fi
 done
-ip=`echo $newip | rev | cut -c 2- | rev`; # Removes trailing period
+ip=$(echo $newip | rev | cut -c 2- | rev); # Removes trailing period
 if [ $firstOctet -eq 0 -o $lastOctet -eq 0 -o $firstOctet -eq 255 -o $lastOctet -eq 255 ]; then
         echo "Invalid IP: $ip";
         return 1;
Created by Jesse Almanrode
View revision

File psudo-array.bsh Added

  • Ignore whitespace
  • Hide word diff 
+#!/bin/bash
+# Use echo to turn the string variable into a pseudo array
+echo "$pseudoArray” | while read line; do
+    echo "$line”;
+    echo "----"; # To show I am processing each line in turn
+done

File root-test.bsh Added

  • Ignore whitespace
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+#/bin/bash
+MY_UID=`id | grep ‘uid=0(root)’; # Running as root or using sudo
+if [ -n “MY_UID” ]; then
+	echo “You must run this tool as your normal user and not using sudo”;
+	exit 1;
+else
+	sudo -k; #Reset sudo timestamp. Doesn’t require a password
+	sudo ls / > /dev/null; #have the user enter their sudo password
+	if [ $? -gt 0 ]; then
+		echo -e “You did not enter the correct sudo password…\nExiting!”;
+		exit 1;
+	fi
+fi
+
+echo “You now have been validated as a user with sudo privileges!” 
+exit 0;

File try-statement.bsh Added

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+#!/bin/bash
+someCommand 2> /dev/null; 
+# Do the command but don’t show an error to the user if one occurs
+if [ “$?” -ne 0 ]; then
+	echo “An Error Occurred”;
+	# Do something about it
+fi
+OR
+
+someCommand; 
+# Show the error to the user, if any, and then do something about it
+if [ “$?” -ne 0 ]; then
+	echo “An Error Occurred”;
+	# Do something about it
+fi

File verify-ipv4.bsh Added

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+#!/bin/bash
+function VERIFY_IP() {
+ip=$1;
+isIP=`echo "$ip" | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'`;
+if [ -z "$isIP" ]; then
+        echo "Not in IP form: $ip";
+        return 1;
+fi
+ipArray=`echo $ip | tr '.' ' '`;
+firstOctet=`echo $ip | cut -d '.' -f1`;
+lastOctet=`echo $ip | cut -d '.' -f4`;
+newip="";
+for octet in $ipArray; do
+        octet=`echo $(( ${octet#0} ))`;
+        if [ $octet -gt 255 ]; then
+                echo "Invalid IP: $ip";
+                return 1;
+        else
+                newip="$newip$octet.";
+        fi
+done
+ip=`echo $newip | rev | cut -c 2- | rev`; # Removes trailing period
+if [ $firstOctet -eq 0 -o $lastOctet -eq 0 -o $firstOctet -eq 255 -o $lastOctet -eq 255 ]; then
+        echo "Invalid IP: $ip";
+        return 1;
+fi
+echo "$ip";
+return 0;
+}
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