navi: Update compression sheet

navi/compression.cheat

@@ -1,20 +1,20 @@
 % compression
 
-# Create a tar containing files
+# Create a tar archive containing files
 tar cf <name>.tar <files>
 
-# Extract the files from a tar
-tar xf <tar_file>
-
-# Create a tar with Gzip compression
+# Create a tar archive with gz compression
 tar czf <name>.tar.gz <files>
 
-# Compress file and appends .gz to its name
-gzip <path>
+# Extract a tar archive
+tar xf <tar_file>
 
-# Decompress compressed file
+# Create a gz archive containing files
+gzip -9 -c <files> > <name>.gz
+
+# Extract a gz archive
 gzip -d <gz_file>
 
-$ path: ls
-$ tar_file: ls *.{tar,tar.*} 2>/dev/null
-$ gz_file: ls *.gz
+$ files: ls | awk -F: '{ print $1}'
+$ tar_file: ls *.{tar,tar.*} | awk -F: '{ print $1}'
+$ gz_file: ls *.gz | awk -F: '{ print $1}'