一、du命令
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- [root@wc1?mysql]#?du?--help??
- Usage:?du?[OPTION]...?[FILE]...??
- ??or:??du?[OPTION]...?--files0-from=F??
- Summarize?disk?usage?of?each?FILE,?recursively?for?directories.??
- ??
- Mandatory?arguments?to?long?options?are?mandatory?for?short?options?too.??
- ??-a,?--all?????????????write?counts?for?all?files,?not?just?directories??
- .......??
這個命令可以顯示每個文件的磁盤使用的概況，對于目錄還可以進行遞歸顯示里面的所有文件的情況。
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舉例：
顯示當前目錄的總大小：
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- [root@ggg2?mysqldata]#?du?-s?-h??
- 7.2G????.??
顯示當前目錄中的所有子目錄、文件的大小，這里只取前10條：
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- [root@ggg2?mysqldata]#?du?-ah?|?head?-10??
- 4.0K????./scripts/mysql_db_shutdown.sh??
- 4.0K????./scripts/mysql_full_backup_by_xtra.sh~??
- 4.0K????./scripts/mysqlplus.sh??
- 4.0K????./scripts/mysql_env.ini??
- 4.0K????./scripts/mysql_full_backup_by_xtra.sh??
- 4.0K????./scripts/mysql_db_startup.sh??
- 28K?./scripts??
- 129M????./3306_cp/data/ib_logfile1??
- 12K?./3306_cp/data/performance_schema/events_stages_current.frm??
- 12K?./3306_cp/data/performance_schema/events_stages_history_long.frm??
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顯示子目錄backup的所有子目錄的明細匯總信息，還有一個額外的 total 值，類似sql 語句里的rollup效果：
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- [root@ggg2?mysqldata]#?du?-ch?backup?|?grep?total??
- 2.4G????total??
同上，只是這里的-0表示不換行顯示：
?-0, --null ? ? ? ? ? ?end each output line with 0 byte rather than newline
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- [root@ggg2?mysqldata]#?du?-c?-0h?backup???
- 636K????backup/2016-10-16_21-47-35/performance_schema20K????backup/2016-10-16_21-47-35/ggg748K??backup/2016-10-16_21-47-35/test1.6M?backup/2016-10-16_21-47-35/mysql2.4G????backup/2016-10-16_21-47-352.3M??backup/mysql_full2.4G???b??
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二、df命令
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- [root@wc1?mysql]#?df?--help??
- Usage:?df?[OPTION]...?[FILE]...??
- Show?information?about?the?file?system?on?which?each?FILE?resides,??
- or?all?file?systems?by?default.??
- ??
- Mandatory?arguments?to?long?options?are?mandatory?for?short?options?too.??
- ??-a,?--all?????????????include?dummy?file?systems??
- ......??
這個命令是顯示每個文件所駐留的文件系統的信息，默認是所有文件系統的情況。
舉例：
顯示每個分區的信息：
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- [root@ggg2?mysqldata]#?df?-h??
- Filesystem??????Size??Used?Avail?Use%?Mounted?on??
- /dev/sda3????????16G???13G??2.4G??85%?/??
- tmpfs???????????936M??228K??936M???1%?/dev/shm??
- /dev/sda1???????194M???36M??148M??20%?/boot??
顯示分區信息，包括虛擬文件系統：
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- [root@ggg2?mysqldata]#?df?-a?-h??
- Filesystem????????Size??Used?Avail?Use%?Mounted?on??
- /dev/sda3??????????16G???13G??2.4G??85%?/??
- proc?????????????????0?????0?????0????-?/proc??
- sysfs????????????????0?????0?????0????-?/sys??
- devpts???????????????0?????0?????0????-?/dev/pts??
- tmpfs?????????????936M??228K??936M???1%?/dev/shm??
- /dev/sda1?????????194M???36M??148M??20%?/boot??
- none?????????????????0?????0?????0????-?/proc/sys/fs/binfmt_misc??
- vmware-vmblock???????0?????0?????0????-?/var/run/vmblock-fuse??
- gvfs-fuse-daemon?????0?????0?????0????-?/root/.gvfs??
顯示inode的 信息，而不是磁盤的使用情況：
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- [root@ggg2?mysqldata]#?df?-i?-h??
- Filesystem?????Inodes?IUsed?IFree?IUse%?Mounted?on??
- /dev/sda3???????1015K??119K??896K???12%?/??
- tmpfs????????????234K?????6??234K????1%?/dev/shm??
- /dev/sda1?????????50K????39???50K????1%?/boot ?
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