user/bkxz

   1 #!/bin/bash
   2
   3 # Date: 2020-04-09T00:09Z
   4
   5 # Author: Steven Baltakatei Sandoval
   6
   7 # Description: Compresses a file or directory using xz at max
   8 # settings. Saves compressed .tar.xz file in the same directory as the
   9 # original file.
  10
  11 # Usage: bkxz [ file or dir ]
  12
  13 echoerr() { echo "$@" 1>&2; } # Define error display function.
  14
  15 TARGET="$1" # Identify first argument as target file or directory.
  16
  17 if ! command -v tar >/dev/null 2>&1; then # Check that 'tar' command exists.
  18     echoerr "ERROR: Command doesn't exist: tar";
  19 fi
  20
  21 if ! command -v xz >/dev/null 2>&1; then # check that 'xz' command exist.
  22     echoerr "ERROR: Command doesn't exist: xz. Suggestion: Install 'xz-utils' package.";
  23     exit 1;
  24 fi
  25
  26 if ! ( [ -f "$TARGET" ] || [ -d "$TARGET" ] ); then # check that TARGET is a file or dir.
  27     echoerr "ERROR: Target is not a file or dir."; exit 1;
  28 fi
  29
  30
  31 TARGET_BASENAME="$(basename "$TARGET")" # Save name of target's basename (ex: 'input.txt' from '/tmp/input.txt').
  32 TARGET_DIRNAME="$(dirname "$TARGET")" # Save name of target's directory (ex: '/tmp' from '/tmp/input.txt').
  33
  34 OUTPUT="$TARGET_DIRNAME"/"$TARGET_BASENAME".tar.xz # Define output file to be in same location as target but with .tar.xz extension.
  35
  36 pushd "$TARGET_DIRNAME" 1>/dev/null 2>&1 # Temporarily navigate to directory holding TARGET.
  37 tar cf - "$TARGET_BASENAME" | xz -9e --lzma2=dict=1536MiB,mf=bt4,nice=273,depth=1000 > "$OUTPUT"
  38 echoerr "Archive saved at: $OUTPUT"
  39 popd 1>/dev/null 2>&1 # Return to original working directory.