26 Ways to practice the substring of a Linux shell by taking variables

######### #20150419 ############################# #题目: Variable a= ' a/b/c ' how to intercept get c @@@@@@@@@@@@@@@@ From the operation and maintenance class 21 long wing finishing @@@@@@@@@@@@@@@@@@@[[email protected] shell]$ uname -r 2.6.32-504. El6.x86_64[[email protected] shell]$ cat /etc/redhat-release centos release  6.6  (Final) method one [[email protected] shell]$ echo  $a  | cut -c5c method two [[ email protected] shell]$ echo  $a  | tr  "a/b/"   "     "    # #四个空格     c    method Three [[email protected]  shell]$ echo  $a  | tr  "/"   "\ n" |tail -1c method four [[Email protected] shell ]$ echo  $a  | tr -d  ' a/b/' C method five [[Email protected] shell]$ echo   $a  | rev |head -c1c[[email protected] shell]$  method six [[email  protected] shell]$ echo  $a  | rEv |cut -c1c method Seven [[email protected] shell]$ echo  $a  | grep -o  "[a-z]$" C method eight [[email protected] shell]$ echo  $a  | grep -o  "[^ab/]" C Method Nine [ [email protected] shell]$ echo  $a  | sed   ' s#.*/## '  c method 10  [[ email protected] shell]$ echo  $a  | sed  ' y#a/b/#    # '   # #四个空格     c Method 11 [[email protected] shell]$ echo  $a  |  sed -r  ' s# .... (.) #\1# '  c method 12 [[email protected] shell]$ echo  $a  | sed -r  ' s#.* ([A-Z ]$) #\1# ' C method 13 [[email protected] shell]$ echo  $a  | awk -F/  ' {print   $NF} ' C method 14 [[email protected] shell]$ echo  $a  | awk  ' {gsub (". * *", "", $ );p Rint} ' C method 15 [[email protected] shell]$ echo  $a  | awk  ' {split ($0,array, "/");p Rint array[3]} ' C method 16 [[email protected] shell]$ echo  $a  | awk   ' {split ($0,array, "a/b/");p rint array[2]} ' C method 17 [[email protected] shell]$ echo $ a | awk  ' {sub (/[^c]+/, "");p Rint} ' C method 18 [[email protected] shell]$ echo  $a  | awk  ' {gsub ("/", "\ n");p rint $3} ' C method 19 [[Email protected] shell]$ echo   $a  | awk  ' {print substr ($0,5,1)  } ' C method 20 [[email protected] shell]$  echo  $a  | awk   ' begin{rs= ' [/\n] "}nr==3 ' C method 21 [[Email protected] shell ]$ echo  $a |cut -d/ -f3   # #上海-Yi Xiaoyi nc method 22 [[Email protected] shell] $ echo ${a:4}# #北京-Xu Fu C method 23 [[email protected] shell]$ echo ${a##*/}## BEIJING-Xu Fu C method 24 [[email protected] shell]$ echo  $a  |tr  "/"   "\ n" |awk  ' nr==3 ' C method 25 [[EMAIL PROTECTED]&NBsp;shell]$ echo ${a:4:1}# #上海-Yi Xiaoyi C Method 26 [[Email protected] shell]$ echo ${a# #a/b/}   # #北京-Liu Xiaotao C

26 Ways to practice the substring of a Linux shell by taking variables