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What is the exit status code of a successfully executed command in Linux shell?

To check if a file /tmp/data.txt is both readable and writable by the current user in a shell conditional, which test is correct?

In shell scripting, which symbol represents all files in the current directory?

In shell scripting, which symbol is used to redirect the standard output to a file, overwriting its contents?

Which command is used to display the last 10 lines of a file in Linux?

Which command is used to read user input from the keyboard and store it in a variable?

Which command is used to search for a pattern in files?

Which construct replaces a command with its output in a POSIX shell?

Which signal is sent by default when using kill without arguments?

What does the #!/bin/bash line at the beginning of a shell script indicate?