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I want similar option like getche() in C. How can I read just a single character input from command line?
Using read command can we do it?
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%s is a format specifier for printf command. Using the format string %s causes the arguments to be concatenated without intervening spaces. It interprets the associated argument literally as string. Joe Smith. Knows FORTRAN, 36-bit MACRO assembler, Perl, and Bash.
$? is the exit status of the most recently-executed command; by convention, 0 means success and anything else indicates failure. That line is testing whether the grep command succeeded. The grep manpage states: The exit status is 0 if selected lines are found, and 1 if not found.
• $* - It stores complete set of positional parameter in a single string. • $@ - Quoted string treated as separate arguments. • $? - exit status of command.
Example of command substitution using $() in Linux: Again, $() is a command substitution which means that it “reassigns the output of a command or even multiple commands; it literally plugs the command output into another context” (Source). Connect RDS to Lightsail.
In bash, read can do it:
read -n1 ans If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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