The command decompresses and extracts the contents of an archived shell script (linuxq3ademo.gz.sh) using the tail, gzip, and tar commands. The command assumes the presence of the linuxq3ademo.gz.sh file in the current directory and utilizes standard Linux toolset commands to perform the extraction.

Cell 15

tail -n +165 linuxq3ademo.gz.sh | gzip -cd | tar xf -

#!/bin/bash

# Extract and decompress the contents of the compressed tar file
tar_xf_gz() {
  # Check if the input file exists and is a gzip compressed tar file
  if [! -f "$1" ]; then
    echo "Error: Input file '$1' not found or is not a gzip compressed tar file."
    return 1
  fi

  # Extract and decompress the contents
  tail -n +165 "$1" | gzip -cd | tar xf -
}

# Call the function with the input file name
tar_xf_gz "linuxq3ademo.gz.sh"

Command Breakdown

Command Overview

The command extracts a specific portion of an archived file, linuxq3ademo.gz.sh, and saves its contents to the current directory.

Parameters

• tail: Extracts the last few lines of a file, specified by the -n +165 option, which extracts from the 165th line onwards.
• gzip: Uncompresses the output of tail using the -cd option, which decompresses the data in place.
• tar: Extracts the contents of the tar archive.
• xf -: Extracts the archive using the -x and -f options, directing the archive to be extracted from standard input (-) instead of a file.

File Overview

• linuxq3ademo.gz.sh: A compressed sh file, which is a shell script. It is assumed to be a compressed archive using gzip.

Command Dependencies

• The tail, gzip, and tar commands are part of the standard Linux toolset.
• The linuxq3ademo.gz.sh file must be in the same directory as the command or in the directory specified by the -f option (if used).