常用linux命令

1. mkdir -p:创建多级目录  eg: mkdir -p  A/B

2. 复制: ctrl+insert 粘贴：shift+insert

3. vi编辑时--》撤销：esc-->u    撤销本次编辑时被撤销的内容：ctrl+R

4. 反引号` `的作用《==》$(),都是执行夹在里面的命令

5. 修改文件的权限：chmod -R 744 *

    修改当前目录下所有的子目录、文件的权限：当前用户rwx   组用户：r   其他用户：r

6. 调试shell脚本：shell -x

7. 替换文件中匹配的字符串：sed -i 's/原字符串/替换字符串/g' filename //替换文件中的所有匹配项

8. 字符串切换编码：iconv -c -f gbk -t utf8 feed_test_data.txt>feed_test_data.txt_utf8

9.  查找：

   find /disk9/cmsdata/file_product -name '*.csv' -type f -newermt "${yesterdaystr}" ! -newermt "${todaystr}" | xargs -i cp -vr {} $rawpath'/' | tee copy.log

  find -newermt

  man find的解释：：

-newerXY reference
              Compares the timestamp of the current file with reference.   The
              reference  argument  is  normally the name of a file (and one of
              its timestamps is used for the comparison) but it may also be  a
              string  describing  an  absolute time.  X and Y are placeholders
              for other letters, and these letters select which time belonging
              to how reference is used for the comparison.


              a   The access time of the file reference
              B   The birth time of the file reference
              c   The inode status change time of reference
              m   The modification time of the file reference
              t   reference is interpreted directly as a time


              Some  combinations are invalid; for example, it is invalid for X
              to be t.  Some combinations are not implemented on all  systems;
              for example B is not supported on all systems.  If an invalid or
              unsupported combination  of  XY  is  specified,  a  fatal  error
              results.   Time  specifications are interpreted as for the argu-
              ment to the -d option of GNU date.  If you try to use the  birth
              time  of  a  reference file, and the birth time cannot be deter-
              mined, a fatal error message results.  If  you  specify  a  test
              which  refers  to  the  birth time of files being examined, this
              test will fail for any files where the birth time is unknown.