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df – report file system disk space usage
Show information about the file system on which each FILE resides, or all file systems by default.
Usage:
df [OPTION]... [FILE]...
Options:
-a, --all include dummy file systems -B, --block-size=SIZE use SIZE-byte blocks -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G) -H, --si likewise, but use powers of 1000 not 1024 -i, --inodes list inode information instead of block usage -k like --block-size=1K -l, --local limit listing to local file systems --no-sync do not invoke sync before getting usage info (default) -P, --portability use the POSIX output format --sync invoke sync before getting usage info -t, --type=TYPE limit listing to file systems of type TYPE -T, --print-type print file system type -x, --exclude-type=TYPE limit listing to file systems not of type TYPE -v (ignored) --help display this help and exit --version output version information and exit SIZE may be (or may be an integer optionally followed by) one of following: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
Example: display available disk space
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/vzfs 30G 21G 9.3G 70% / none 512M 4.0K 512M 1% /dev /dev/vzfs 30G 21G 9.3G 70% /var/named/run-root/var/run/dbus
du – estimate file space usage
Summarize disk usage of each FILE, recursively for directories.
Usage:
du [OPTION]... [FILE]... du [OPTION]... --files0-from=F
Options:
-a, --all write counts for all files, not just directories --apparent-size print apparent sizes, rather than disk usage; although the apparent size is usually smaller, it may be larger due to holes in (`sparse') files, internal fragmentation, indirect blocks, and the like -B, --block-size=SIZE use SIZE-byte blocks -b, --bytes equivalent to `--apparent-size --block-size=1' -c, --total produce a grand total -D, --dereference-args dereference FILEs that are symbolic links --files0-from=F summarize disk usage of the NUL-terminated file names specified in file F -H like --si, but also evokes a warning; will soon change to be equivalent to --dereference-args (-D) -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G) --si like -h, but use powers of 1000 not 1024 -k like --block-size=1K -l, --count-links count sizes many times if hard linked -m like --block-size=1M -L, --dereference dereference all symbolic links -P, --no-dereference don't follow any symbolic links (this is the default) -0, --null end each output line with 0 byte rather than newline -S, --separate-dirs do not include size of subdirectories -s, --summarize display only a total for each argument -x, --one-file-system skip directories on different file systems -X FILE, --exclude-from=FILE Exclude files that match any pattern in FILE. --exclude=PATTERN Exclude files that match PATTERN. --max-depth=N print the total for a directory (or file, with --all) only if it is N or fewer levels below the command line argument; --max-depth=0 is the same as --summarize --time show time of the last modification of any file in the directory, or any of its subdirectories --time=WORD show time as WORD instead of modification time: atime, access, use, ctime or status --time-style=STYLE show times using style STYLE: full-iso, long-iso, iso, +FORMAT FORMAT is interpreted like `date' --help display this help and exit --version output version information and exit SIZE may be (or may be an integer optionally followed by) one of following: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
Examples: display size of a directory
$ du -hs /path/to/dir 9.2G /path/to/dir
stat – display file or file system status
Usage:
stat [OPTION]... FILE...
Options:
-L, --dereference follow links -f, --file-system display file system status instead of file status -c --format=FORMAT use the specified FORMAT instead of the default; output a newâ line after each use of FORMAT --printf=FORMAT like --format, but interpret backslash escapes, and do not outâ put a mandatory trailing newline. If you want a newline, include n in FORMAT -t, --terse print the information in terse form --help display this help and exit --version output version information and exit The valid format sequences for files (without --file-system): %a Access rights in octal %A Access rights in human readable form %b Number of blocks allocated (see %B) %B The size in bytes of each block reported by %b %C SELinux security context string %d Device number in decimal %D Device number in hex %f Raw mode in hex %F File type %G Group name of owner %h Number of hard links %i Inode number %m Mount point %n File name %N Quoted file name with dereference if symbolic link %o I/O block size %s Total size, in bytes %t Major device type in hex %T Minor device type in hex %u User ID of owner %U User name of owner %w Time of file birth, human-readable; - if unknown %W Time of file birth, seconds since Epoch; 0 if unknown %x Time of last access, human-readable %X Time of last access, seconds since Epoch %y Time of last modification, human-readable %Y Time of last modification, seconds since Epoch %z Time of last change, human-readable %Z Time of last change, seconds since Epoch Valid format sequences for file systems: %a Free blocks available to non-superuser %b Total data blocks in file system %c Total file nodes in file system %d Free file nodes in file system %f Free blocks in file system %i File System ID in hex %l Maximum length of filenames %n File name %s Block size (for faster transfers) %S Fundamental block size (for block counts) %t Type in hex %T Type in human readable form
Example: display file system status
$ stat -f /
File: "/"
ID: 2b6896ea6511332f Namelen: 255 Type: ext2/ext3
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 2090580 Free: 1663166 Available: 1558309
Inodes: Total: 524288 Free: 421462
Alternative way to display file size using ls command
$ ls -lah filename | awk '{ print $5}'
