📖 Added more bash examples to cheatsheet

content/en/posts/bash_cheatsheet.md

@@ -192,8 +192,70 @@ function fun(){
 	echo fun
 }
 ```
+# String Manipulation
+## Concatenate Strings
+``` bash
+string1=abc
+string2=def
+echo "$string1string2ghi jkl"
+# Outputs: abcdefghi jkl
+```
+## Extract String
+``` bash
+string="hello/devoalda/devo.com"
+
+# Get Filename
+echo ${string##*/}
+# Outputs: devo.com
+
+# Get Path
+echo ${string%/*}
+# Outputs: hello/devoalda
+
+# Get File Extension
+echo ${string##*.}
+# Outputs: com
+
+# Multiple Operations
+NAME=${string##*/}      # remove part before last slash
+echo ${NAME%.*}        # from the new var remove the part after the last period
+# Outputs: devo
+```
+## String contain substring
+
+{{< tabs bash python>}}
+  {{< tab >}}
+
+### bash 
+
+``` bash
+echo "This is a bash script" | grep "bash"
+# True if "bash" is in sentence
+
+test='GNU/Linux is an operating system'
+if [[ $test == *"Linux"* ]]; then
+	echo "true"
+fi
+
+```
+
+  {{< /tab >}}
+  {{< tab >}}
+
+### python
+``` python
+test='GNU/Linux is an operating system'
+if "Linux" in test:
+	print('true')
+else:
+	print('false')
+```
+  {{< /tab >}}
+{{< /tabs >}}
+
 {{< expand "Credits/References" >}}
 [stackoverflow1](https://stackoverflow.com/questions/6697753/difference-between-single-and-double-quotes-in-bash)
 [stackoverflow2](https://stackoverflow.com/questions/2013547/assigning-default-values-to-shell-variables-with-a-single-command-in-bash)
+[stackoverflow3](https://stackoverflow.com/a/19482947)
 {{< /expand >}}