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User Input

QUOTING --- HOME --- ARITHMETIC OPERATIONS

read command accept input from the keyboard and assign an input value to the user defined shell variable.

read -p "PROMPT" VARIABLE-1 VARIABLE-2 ...

Handling Passwords

-s option causes input from terminal not to be displayed on the screen.

read -s VARIABLE

Timeout Input

We can timeout read command using -t option. It causes read to timeout & returns failure if complete line of input is not read.

read -t TIMEOUT -p "PROMPT" VARIABLE

IFS (Internal File Seperator)

By default ifs is set to space or next line.

old=$IFS
IFS=:                                               # Changing IFS
pwd="kshitizsaini113:x:0:0:/home:/bin/bash"
read -r login pass uid gid home shell <<< "$pwd"
IFS=$old                                            # Restoring IFS