What is the meaning of $? in a shell script?

23 Feb 2026 — A shell script is essentially a sequence of commands stored in a text file, which the shell executes in order. Understanding the structure and ...Read more

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31 Mar 2022 — A bash script is a series of commands written in a file. These are read and executed by the bash program. The program executes line by line.Read more

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File descriptor 1 is the standard output ( stdout ). File descriptor 2 is the standard error ( stderr ). At first, 2>1 may look like a good ...Read more

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6 Jun 2023 — A Bourne Shell Programming / Scripting Tutorial for learning about using the Unix shell. Learn Linux / Unix shell scripting by example along ...Read more

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19 Mar 2025 — Using shell scripts on Linux involves writing a series of commands in a text file that the shell (command line interpreter) can execute.Read more

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One of the first scripts I put together after moving to Linux full time was an automated TAR backup script (creates system backups at regular ...Read more

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script makes a typescript of everything on your terminal session. The terminal data are stored in raw form to the log file and information about timing.Read more

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27 Jan 2021 — The purpose of script is that you can easily grab sample output from any command through an interactive session exactly as it's displayed in your terminal.Read more

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20 Feb 2011 — $? determines the exit status of the executed command. $ followed by numbers (e.g. $1 , $2 , etc.) represents the parameters in the shell script ...Read more

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