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Shell Scripting Comments Any line starting with a hash (#) becomes comment. Comment means, that line will not take part in script…

Shell Scripting She-bang The sign #! is called she-bang and is written at top of the script. It passes instruction to program…

Shell Scripting let command The let command is an arithmetic operator. It is almost same as (( )). Only difference is that,…

Shell Script Parameters A bash shell script have parameters. These parameters start from $1 to $9. When we pass arguments into the…

Shell Scripting case A case construct helps us to simplify nested if statement. You can match several variables against one variable. Each…

Shell Scripting eval command The eval command is a built-in command. It takes a string as its argument and evaluate it, then…

Shell Scripting Prevent setuid root spoofing Spoofing is a technique through which a user tries to grant unauthorized access on a system…

Shell Scripting Shift Through Parameters Shift command is a built-in command. Command takes number as argument. Arguments shift down by this number.…

Shell Scripting for loop The for loop moves through a specified list of values until the list is exhausted. 1) Syntax: Syntax…

Shell Scripting Sourcing a config file Many programs use external configuration files. Use of external configuration files prevents a user from making…