If we want to substitute some text with new text, then we can use commands. After the forward slash, the regular expression is enclosed and then the text to be substituted is placed. If the g option is used, then substitution will happen globally, meaning that it will be applied to the full document. Otherwise, only the first instance will be substituted:
$ cat shopping.txt
The output is as follows:
Product Quantity Unit_Price Total_Cost
Apple 2 3 6
Orange 2 .8 1.6
Papaya 2 1.5 3
Chicken 3 5 15
Cashew 1 10 10
$ sed 's/Cashew/Almonds/g' shopping.txt
The output is as follows:
Product Quantity Unit_Price Total_Cost
Apple 2 3 6
Orange 2 .8 1.6
Papaya 2 1.5 3
Chicken 3 5 15
Almonds 1 10 10
The s command has ...
