在Linux中删除超大(100-200GB)文件的实现方式

[root@docker][19:43:12][OK] ~ 
#yum provides */ionice
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * epel: mirror.01link.hk
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
epel/x86_64/filelists_db                                                                                                     |  12 MB  00:00:08     
extras/7/x86_64/filelists_db                                                                                                 | 276 kB  00:00:01     
updates/7/x86_64/filelists_db                                                                                                |  10 MB  00:00:42     
util-linux-2.23.2-65.el7.i686 : A collection of basic system utilities
Repo        : base
Matched from:
Filename    : /usr/bin/ionice
Filename    : /usr/share/bash-completion/completions/ionice
 
 
 
util-linux-2.23.2-65.el7.x86_64 : A collection of basic system utilities
Repo        : base
Matched from:
Filename    : /usr/bin/ionice
Filename    : /usr/share/bash-completion/completions/ionice
 
 
 
util-linux-2.23.2-65.el7_9.1.i686 : A collection of basic system utilities
Repo        : updates
Matched from:
Filename    : /usr/bin/ionice
Filename    : /usr/share/bash-completion/completions/ionice
 
 
 
util-linux-2.23.2-65.el7_9.1.x86_64 : A collection of basic system utilities
Repo        : updates
Matched from:
Filename    : /usr/bin/ionice
Filename    : /usr/share/bash-completion/completions/ionice
 
 
 
util-linux-2.23.2-65.el7.x86_64 : A collection of basic system utilities
Repo        : @anaconda
Matched from:
Filename    : /usr/bin/ionice
Filename    : /usr/share/bash-completion/completions/ionice

yum install util-linux-2.23.2-65.el7_9.1.x86_64 -y

[root@docker][19:35:01][OK] ~ 
#ionice --help
 
ionice - sets or gets process io scheduling class and priority.
 
Usage:
  ionice [OPTION] -p PID [PID...]
  ionice [OPTION] COMMAND
 
Options:
  -c, --class <class>   scheduling class name or number
                           0: none, 1: realtime, 2: best-effort, 3: idle
  -n, --classdata <num> scheduling class data
                           0-7 for realtime and best-effort classes
  -p, --pid=PID         view or modify already running process
  -t, --ignore          ignore failures
  -V, --version         output version information and exit
  -h, --help            display this help and exit

—- Deleting Huge Files in Linux —–
# ionice -c 3 rm /var/logs/syslog
# ionice -c 3 rm -rf /var/log/apache

yum install coreutils-8.22-24.el7_9.2.x86_64 -y

[root@192_168_209_128 ~]# shred --help
Usage: shred [OPTION]... FILE...
Overwrite the specified FILE(s) repeatedly, in order to make it harder
for even very expensive hardware probing to recover the data.
Mandatory arguments to long options are mandatory for short options too.
  -f, --force    change permissions to allow writing if necessary
  -n, --iterations=N  overwrite N times instead of the default (3)
      --random-source=FILE  get random bytes from FILE
  -s, --size=N   shred this many bytes (suffixes like K, M, G accepted)
  -u, --remove[=HOW]  truncate and remove file after overwriting; See below
  -v, --verbose  show progress
  -x, --exact    do not round file sizes up to the next full block;
                   this is the default for non-regular files
  -z, --zero     add a final overwrite with zeros to hide shredding
      --help     display this help and exit
      --version  output version information and exit

[root@docker][19:51:03][OK] ~ 
#shred -zvu -n 5 cuttingLog_bak 
shred: cuttingLog_bak: pass 1/6 (random)...
shred: cuttingLog_bak: pass 2/6 (ffffff)...
shred: cuttingLog_bak: pass 3/6 (random)...
shred: cuttingLog_bak: pass 4/6 (000000)...
shred: cuttingLog_bak: pass 5/6 (random)...
shred: cuttingLog_bak: pass 6/6 (000000)...
shred: cuttingLog_bak: removing
shred: cuttingLog_bak: renamed to 00000000000000
shred: 00000000000000: renamed to 0000000000000
shred: 0000000000000: renamed to 000000000000
shred: 000000000000: renamed to 00000000000
shred: 00000000000: renamed to 0000000000
shred: 0000000000: renamed to 000000000
shred: 000000000: renamed to 00000000
shred: 00000000: renamed to 0000000
shred: 0000000: renamed to 000000
shred: 000000: renamed to 00000
shred: 00000: renamed to 0000
shred: 0000: renamed to 000
shred: 000: renamed to 00
shred: 00: renamed to 0
shred: cuttingLog_bak: removed

rpm -ivh wipe-2.2.0-1.2.el7.rf.x86_64.rpm

[root@docker][19:58:11][OK] ~ 
#wipe -h
Wipe v2.2.0 - released January 10, 2004
by Tom Vier <nester@users.sf.net>
 
Usage is wipe [options] [file-list]
 
Options:         Default: wipe -ZdntVAkO -S512 -C4096 -l1 -x8 -p1
 
-h          --   help - display this screen
-u          --   usage
-c          --   show copyright and license
-w          --   show warranty information
-i  and  -I --   enable (-i) or disable (-I) interaction - overrides force
-f          --   force file wiping and override interaction
-r  and  -R --   recursion - traverse subdirectories
-s          --   silent - disable percentage and error reporting
-v          --   force verbose - always show percentage
-V          --   verbose - show percentage if file is >= 25K
-d  and  -D --   delete (-d) or keep (-D) after wiping
-n  and  -N --   delete (-n) or skip (-N) special files
-k  and  -K --   lock (-k) or don't lock (-K) files
-z          --   zero-out file - single pass of zeroes
-Z          --   perform normal wipe passes
-t  and  -T --   enable (-t) or disable (-T) static passes
-a  and  -A --   write until out of space (-a) or don't (-A)
-o[size] -O --   write to stdout (-o) or use files (-O)
-B(count)   --   block device sector count
-S(size)    --   block device sector size - default 512 bytes
                 or stdout write length when used with -A
-C(size)    --   chunk size - maximum file buffer size in kilobytes (2^10)
-l[0-2]     --   sets wipe secure level
-x[1-32] -X --   sets number of random passes per wipe or disables
-p(1-32)    --   wipe file x number of times
-b(0-255)   --   overwrite file with this value byte

[root@docker][19:59:50][OK] ~ 
#wipe -fi cuttingLog_bak 
wipe: destroy file `cuttingLog_bak'? y

yum -y install srm-1.2.15-1.el7.x86_64

[root@docker][20:05:39][OK] ~ 
#srm --help
Usage: srm [OPTION]... [FILE]...
Overwrite and remove (unlink) the files. By default use the 35-pass Gutmann
method to overwrite files.
 
  -d, --directory       ignored (for compatability with rm(1))
  -f, --force           ignore nonexistant files, never prompt
  -i, --interactive     prompt before any removal
  -x, --one-file-system do not cross file system boundaries
  -s, --simple          overwrite with single pass using 0x00 (default)
  -P, --openbsd         overwrite with three passes like OpenBSD rm
  -D, --dod             overwrite with 7 US DoD compliant passes
  -E, --doe             overwrite with 3 US DoE compliant passes
  -G, --gutmann         overwrite with 35-pass Gutmann method
  -C, --rcmp            overwrite with Royal Canadian Mounted Police passes
  -r, -R, --recursive   remove the contents of directories
  -v, --verbose         explain what is being done
  -h, --help            display this help and exit
  -V, --version         display version information and exit

#srm -vf cuttingLog_bal 
srm: removing cuttingLog_bal