| 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. |