LINUX Redhat Fourth Unit exercises

1. Execute the find/etc-name passwd command under the student user and manage its output requirements as follows:
   
   * Show all correct output, mask error output

   find/etc/-name passwd 2>>/dev/null

   650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M01/8F/5C/wKiom1jblpSQoNLbABGJkGcXbZU448.png-wh_500x0-wm_ 3-wmp_4-s_4202433481.png "title=" screenshot from 2017-03-29 19-01-30.png "alt=" Wkiom1jblpsqonlbabgjkgcxbzu448.png-wh_50 "/>
   

   
   * Save correct number out to/tmp/find.out, error number out to/tmp/find.err

   find/etc/-name passwd >>/tmp/find.out 2>>/tmp/find.err

   650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M02/8F/5A/wKioL1jbl0vwmGhVAAqClllAvdw003.png-wh_500x0-wm_ 3-wmp_4-s_2186560934.png "title=" screenshot from 2017-03-29 19-13-36.png "alt=" Wkiol1jbl0vwmghvaaqclllavdw003.png-wh_50 "/>
   * Create/tmp/find.all file, and save all output to this file

   find/etc/-name passwd &>>/tmp/find.all

   650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M00/8F/5C/wKiom1jbl8Lx1D9WAAxi6xlMCTY863.png-wh_500x0-wm_ 3-wmp_4-s_4143383265.png "title=" screenshot from 2017-03-29 19-15-32.png "alt=" Wkiom1jbl8lx1d9waaxi6xlmcty863.png-wh_50 "/>
   * Save all output to/tmp/find.all again, and keep the contents of the source file

   find/etc/-name passwd &>>/tmp/find.all

   650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M00/8F/5A/wKioL1jbmHvDcHkCAAzF1bsKL0Y093.png-wh_500x0-wm_ 3-wmp_4-s_546749926.png "title=" screenshot from 2017-03-29 19-18-45.png "alt=" Wkiol1jbmhvdchkcaazf1bskl0y093.png-wh _50 "/>
   * Block all output from this command

   find/etc/-name passwd &>>/dev/null

   650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M00/8F/5C/wKiom1jbmMKC0Vy7ABF4xe9hucc105.png-wh_500x0-wm_ 3-wmp_4-s_4097865153.png "title=" screenshot from 2017-03-29 19-19-56.png "alt=" Wkiom1jbmmkc0vy7abf4xe9hucc105.png-wh_50 "/>
   * Show all output of this command and save output to any file on the desktop

   find/etc/-name passwd 2>&1 | Tee find.out

   650) this.width=650; "src=" http://img.blog.csdn.net/20170330103517807 "alt=" 20170330103517807 "/>
   

   
   * Save correct output to/tmp/find.out.1, mask error output

   find/etc/-name passwd >/tmp/find.out.1 2>/dev/null
   650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M02/8F/5A/wKioL1jbm5Pg04dgAAzXo1JbtZE936.png-wh_500x0-wm_ 3-wmp_4-s_1923687753.png "title=" screenshot from 2017-03-29 19-31-58.png "alt=" Wkiol1jbm5pg04dgaazxo1jbtze936.png-wh_50 "/>
   2. Processing documents in document/usr/share/mime/packages/freedesktop.org.xml requirements are as follows:
   
   * Locate the line containing ICH in this file and save these lines to/root/lines

   grep ich/usr/share/mime/packages/freedesktop.org.xml >/root/lines

   650) this.width=650; "Src=" http://img.blog.csdn.net/20170329224129349?watermark/2/text/ ahr0cdovl2jsb2cuy3nkbi5uzxqvc29saxr1zgvftq==/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity/ Southeast "alt=" Southeast "/>
   

   
   * Replace the space in/root/lines with vim, but keep the contents of the file

   %s/^\ *//g
   

   650) this.width=650; "Src=" http://img.blog.csdn.net/20170329224201146?watermark/2/text/ ahr0cdovl2jsb2cuy3nkbi5uzxqvc29saxr1zgvftq==/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity/ Southeast "alt=" Southeast "/>
   

LINUX Redhat Fourth Unit exercises