From 847beb446f94da15aac5191d804c0f8d3ade7a56 Mon Sep 17 00:00:00 2001
From: Hizenberg469 <growlingraptor@gmail.com>
Date: Wed, 20 Nov 2024 12:27:31 +0530
Subject: [PATCH] update

---
 Bash-Scripting.txt | 107 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 106 insertions(+), 1 deletion(-)

diff --git a/Bash-Scripting.txt b/Bash-Scripting.txt
index 2b33dcf..9737ad4 100644
--- a/Bash-Scripting.txt
+++ b/Bash-Scripting.txt
@@ -192,4 +192,109 @@
     non-zero value.
 
     We can exit script using exit command.
-    exit command can be used with number 0 - 255.
\ No newline at end of file
+    exit command can be used with number 0 - 255.
+
+-> If Statement
+
+    if[ condition ]; then
+        ....
+    elif[ condition ]; then
+        ....
+    elif[ condition ]; then
+        ....
+    else
+        ....
+    fi
+
+    * AND with if statement ?
+
+    if[ condition ] && [ condition ]; then
+        ....
+    fi
+
+    * OR wiht if statement ?
+
+    if[ condition ] || [ condition ]; then
+        ....
+    fi
+
+    * Negate if condition
+
+    if[ !condition ]; then
+        ....
+    fi
+
+    if![ condition ]; then
+        ....
+    fi
+
+-> Mathematical comparison:
+
+    * Operands
+
+        $ -eq   equal to
+        $ -ne   not equal to
+        $ -gt   greater than
+        $ -lt   less than
+        $ -ge   greater than or equal to
+        $ -le   less than or equal to
+
+    Examples:
+
+        if [ $VAR -eq 5 ]; then
+        if [ $VAR -gt 7 ]; then
+        if [ $VAR -eq 5 ] && [ $COUNT -ne 1 ]; then
+
+
+
+-> String Comaparison
+
+    * Comapare two strings
+    [ "$STR1" = "$STR2" ]
+    [ "$STR1" != "$STR2" ]
+
+    [ "$STR1" = "hello" ]
+    [ "$STR1" != "hello" ]
+
+    * Compare two strings - quotation marks?
+      Bash can handle it in another way [[ ]]
+
+      [[ $STR1 = $STR2 ]]
+      [[ $STR1 != $STR2 ]]
+
+      [[ $STR1 = "hello" ]]
+      [[ $STR1  != "hello ]]
+
+      This is not widely used and most scripts
+      are using quotation marks with single 
+      brackets
+
+    * Test if string is empty
+
+        [ -z "$STR1" ] returns true if STR1 holds
+                        an empty string
+
+        [[ -z $STR1 ]] possible, but not widely used
+        
+        [ -n "$STR1" ] returns true if STR1 holds
+                        a non-empty string
+
+        [[ -n $STR1 ]] possible, but not widely used
+
+    * Alphabetically compare two strings
+
+    [[ $STR1 > $STR2 ]]
+
+    [[ $STR1 < $STR2 ]]
+
+    No choice!!!
+
+    * Wildcards
+
+        [[ $STR1 == string-with-wildcards ]]
+
+    * Regular expression
+
+        [[ $STR1 =~ $regex ]]
+
+        
\ No newline at end of file