epynic · September 16, 2022 16:43 · Jan 31, 2019 · Jan 31, 2019
diff --git a/debugging.sh b/debugging.sh
@@ -0,0 +1,12 @@
+#debugging shellscripts -x would show the scrips line by line and output followed by
+#!/bin/bash -x
+TEST_VAR="test"
+echo "$TEST_VAR"
+#custom
+#set -x / start debugginh 
+#set +x / stop
+#-ex exit on stop
+#-v prints shell before substitution are applied
+#-vx 
+#DEBUG="echo"
+#$DEBUG ls
diff --git a/decisions_case.sh b/decisions_case.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+#case statement example
+read -p "Enter y or n:" ANSWER
+case "$ANSWER" in
+    [yY]|[yY][eE][sS])
+        echo "You answered yes."
+        ;;
+    [nN]|[nN][oO])
+        echo "You answered no."
+        ;;
+   *)
+        echo "Invalid answer."
+        ;;
+esac
diff --git a/decisions_if.sh b/decisions_if.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+#decisions
+HOST_NAME="windows"
+#simple if
+if [ $HOST_NAME = "ubuntu" ]; then
+        echo "Ubuntu for humans"
+fi
+#if else
+if [ $HOST_NAME = "ubuntu" ]; then
+        echo "Ubuntu for humans"
+else
+        echo "Windows for !humans"
+fi
+#if elif else
+if [ $HOST_NAME = "ubuntu" ]; then
+        echo "Ubuntu for humans"
+elif [ $HOST_NAME = "windows" ]; then
+        echo "We !Love Windows"
+else
+        echo "Windows for !humans"
+fi
diff --git a/file_operations.sh b/file_operations.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+#file operators
+FILE="basic.sh"
+if [ -e $FILE ]; then
+        echo "File Exists"
+else
+        echo "No File Found"
+fi
+
+#-d,e,r,w,x
+#string operations
+#arithmetic operations are allowed
+#arg1 -eq arg2 - equalto
+#arg1 -ne arg2 - !equalto
+#arg1 -lt arg2 - less than
+#arg1 -le arg2 - less than equalto
+#arg1 -gt arg2 - greater than
+#arg1 -ge arg2 - greater than equalto
diff --git a/logging_example.sh b/logging_example.sh
@@ -0,0 +1,17 @@
+#syslog
+
+#logger -p user.info "$MESSAGE"
+#logger -i -t randomly -p user.info "$MESSAGE"
+#while loop
+while [ "$CORRECT" != "y" ]
+do
+        read -p "Whats your name ? " NAME
+        read -p "Is your Name: $NAME - correct ?" CORRECT
+done
+#read file line by line
+LINE_NUM=1
+while read LINE
+do
+  echo "${LINE_NUM}: ${LINE}"
+  ((LINE_NUM++))
+done < /etc/fstab
diff --git a/loops.sh b/loops.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+#loops
+COLORS="red green blue"
+for COLOR in $COLORS
+do
diff --git a/wildcard_examples.sh b/wildcard_examples.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+#wildcards *.txt match zero or more characters
+#?.txt match exactly one character
+ls *\? #file end with ?
+ls ? #file 1 character
+ls -l *.txt
+ls c[aeiou]t #character class
+#can use this with mv cp rm
+#copy .html files to another folder - wildcards
+cd /var/www
+for FILE in *.html
+do
+        echo "Copying $FILE"
+        cp $FILE /var/www-backup
+done
diff --git a/define_variables.sh b/define_variables.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+#declare variable
+SERVER_NAME="nginx"
+echo $SERVER_NAME
+echo "We are running on $SERVER_NAME"
+echo "We are ${SERVER_NAME}er";
+
+#command output to variable
+SERVER_NAME=$(hostname)
+echo "We are running on $SERVER_NAME"
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