# cp -p /bin/ls .
# ls -l ls
-rwxr-xr-x 1 root root 95116 3月 21 2012 ls
# gzip ls
# cat /bin/ls | gzip > ls2.gz
# cat /bin/ls | gzip - > ls3.gz
# ls -l
合計 132
-rwxr-xr-x 1 root root 44544 3月 21 2012 ls.gz
-rw-r--r-- 1 root root 44541 3月 16 22:48 ls2.gz
-rw-r--r-- 1 root root 44541 3月 16 22:48 ls3.gz
# gzip -lv ls.gz
method crc date time compressed uncompressed ratio uncompressed_name
defla a45cfe5d Mar 21 21:35 44544 95116 53.2% ls
# gzip -lv ls2.gz
method crc date time compressed uncompressed ratio uncompressed_name
defla a45cfe5d Mar 16 22:48 44541 95116 53.2% ls2
# gzip -lv ls3.gz
method crc date time compressed uncompressed ratio uncompressed_name
defla a45cfe5d Mar 16 22:48 44541 95116 53.2% ls3
# gzip -d ls.gz
# gzip -d ls2.gz
# gzip -d ls3.gz
# ls -l
合計 300
-rwxr-xr-x 1 root root 95116 3月 21 2012 ls
-rw-r--r-- 1 root root 95116 3月 16 22:48 ls2
-rw-r--r-- 1 root root 95116 3月 16 22:48 ls3
# md5sum ls ls2 ls3
9b13f57c554ef462f27ca2207a4ce8bc ls
9b13f57c554ef462f27ca2207a4ce8bc ls2
9b13f57c554ef462f27ca2207a4ce8bc ls3
