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technology/applications/cli/Shell.md
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@ -133,7 +133,7 @@ command2 < mypipe # Reading from the pipe
### **tee Command**
The `tee` command reads from standard input and writes to standard output and files simultaneously.
```shell
echo "Hello, World!" | tee output.txt | wc -l
echo "Hello, World!" | tee output.txt | wc -l
```
### **/dev/null**
@ -210,7 +210,7 @@ esac
#### Operators
##### Arithmetic Operators
Assume variable **a** holds 10 and variable **b** holds 20 then −
Assume variable **a** holds 10 and variable **b** holds 20 then −
| Operator | Description | Example |
| ------------------ | --------------------------------------------------------------------- | --------------------------------------- |
@ -226,7 +226,7 @@ Assume variable **a** holds 10 and variable **b** holds 20 then −
##### Relational Operators
For example, following operators will work to check a relation between 10 and 20 as well as in between "10" and "20" but not in between "ten" and "twenty".
Assume variable **a** holds 10 and variable **b** holds 20 then −
Assume variable **a** holds 10 and variable **b** holds 20 then −
| Operator | Description | Example |
| -------- | ------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------- |
@ -238,18 +238,18 @@ Assume variable **a** holds 10 and variable **b** holds 20 then −
| **-le** | Checks if the value of left operand is less than or equal to the value of right operand; if yes, then the condition becomes true. | `[ $a -le $b ]` is true. |
##### Boolean Operators
Assume variable **a** holds 10 and variable **b** holds 20 then −
Assume variable **a** holds 10 and variable **b** holds 20 then −
| Operator | Description | Example |
| -------- | -------------------------------------------------------------------------------------------------------- | ------------------------------------- |
| **!** | This is logical negation. This inverts a true condition into false and vice versa. | `[ ! false ]` is true. |
| **-o** | This is logical **OR**. If one of the operands is true, then the condition becomes true. | `[ $a -lt 20 -o $b -gt 100 ]` is true. |
| **-a** | This is logical **AND**. If both the operands are true, then the condition becomes true otherwise false. | `[ $a -lt 20 -a $b -gt 100 ]` is false. |
| **-o** | This is logical **OR**. If one of the operands is true, then the condition becomes true. | `[ $a -lt 20 -o $b -gt 100 ]` is true. |
| **-a** | This is logical **AND**. If both the operands are true, then the condition becomes true otherwise false. | `[ $a -lt 20 -a $b -gt 100 ]` is false. |
##### File Test Operators
We have a few operators that can be used to test various properties associated with a Unix file.
Assume a variable **file** holds an existing file name "test" the size of which is 100 bytes and has **read**, **write** and **execute** permission.
Assume a variable **file** holds an existing file name "test" the size of which is 100 bytes and has **read**, **write** and **execute** permission.
| Operator | Description | Example |
| ----------- | ---------------------------------------------------------------------------------------------------------------------- | --------------------------- |