模板建站合同,如何修改wordpress手机模板,游戏推广赚佣金平台,官方网站免费制作linux命令之md5sum
1.md5sum介绍
linux命令md5sum是用来计算和校验文件的MD5值。
另外#xff1a;
md5sum是用来校验文件内容#xff0c;与文件名是否相同无关
md5sum校验文件时#xff0c;逐位校验#xff0c;如果文件越大#xff0c;校验所需时间就越长
2.md5sum用…linux命令之md5sum
1.md5sum介绍
linux命令md5sum是用来计算和校验文件的MD5值。
另外
md5sum是用来校验文件内容与文件名是否相同无关
md5sum校验文件时逐位校验如果文件越大校验所需时间就越长
2.md5sum用法
md5sum [参数] filename
md5sum参数 参数说明-b以二进制模式读入文件内容-t以文本模式读入文件内容-c从指定文件中读取 MD5 校验和并进行校验--status不生成[争取/错误]提示信息通过命令返回值来判断
3.实例
3.1.查看md5sum帮助信息
命令
md5sum --help [rootrhel77 ~]# md5sum --help
Usage: md5sum [OPTION]... [FILE]...
Print or check MD5 (128-bit) checksums.
With no FILE, or when FILE is -, read standard input.-b, --binary read in binary mode-c, --check read MD5 sums from the FILEs and check them--tag create a BSD-style checksum-t, --text read in text mode (default)Note: There is no difference between binary and text mode option on GNU system.The following four options are useful only when verifying checksums:--quiet dont print OK for each successfully verified file--status dont output anything, status code shows success--strict exit non-zero for improperly formatted checksum lines-w, --warn warn about improperly formatted checksum lines--help display this help and exit--version output version information and exitThe sums are computed as described in RFC 1321. When checking, the input
should be a former output of this program. The default mode is to print
a line with checksum, a character indicating input mode (* for binary,
space for text), and name for each FILE.GNU coreutils online help: http://www.gnu.org/software/coreutils/
For complete documentation, run: info coreutils md5sum invocation
[rootrhel77 ~]# 3.2.检查文件md5值
命令
md5sum -t ztj.txt
OR
md5sum -b ztj.txt rootrhel77 ~]# md5sum -t ztj.txt
cfc12d1432a7b067566080122b1c4f85 ztj.txt
[rootrhel77 ~]# md5sum -b ztj.txt
cfc12d1432a7b067566080122b1c4f85 *ztj.txt
[rootrhel77 ~]# 3.3.检查文件md5值与文件无关
命令
\cp ztj.txt ztj.txt.bak
md5sum ztj.txt
md5sum ztj.txt.bak rootrhel77 ~]# \cp ztj.txt ztj.txt.bak
[rootrhel77 ~]# md5sum ztj.txt
cfc12d1432a7b067566080122b1c4f85 ztj.txt
[rootrhel77 ~]# md5sum ztj.txt.bak
cfc12d1432a7b067566080122b1c4f85 ztj.txt.bak
[rootrhel77 ~]# 3.4.从指定文件中读取MD5校验和并进行校验
命令
md5sum ztj.txt md5sum.txt
md5sum -c md5sum.txt [rootrhel77 ~]# md5sum ztj.txt md5sum.txt
[rootrhel77 ~]#
[rootrhel77 ~]# md5sum -c md5sum.txt
ztj.txt: OK
[rootrhel77 ~]# 3.5.从指定文件中读取MD5校验和并不显示校验信息以命令返回值来判断
备注
如果校验一致返回0不一致返回1
命令
md5sum -c --status md5sum.txt
echo $?
[rootrhel77 ~]# md5sum -c --status md5sum.txt
[rootrhel77 ~]# echo $?
0
[rootrhel77 ~]# OR
命令
echo 111 ztj.txt
md5sum -c --status md5sum.txt
echo $?
[rootrhel77 ~]# echo 111 ztj.txt
[rootrhel77 ~]#
[rootrhel77 ~]# md5sum -c --status md5sum.txt
[rootrhel77 ~]# echo $?
1
[rootrhel77 ~]#
