linux shell 常用命令

grep [options] [regex] [files]

/var/root # grep -n "o" *                                                       
hello.c:1:/* This C source can be compiled with:                                
hello.c:3:   tcc -o hello hello.c                                               
hello.c:5:   or if you have more time:                                          
hello.c:7:   gcc -o hello hello.c                                               
hello.c:10:#include <stdio.h>                                                   
hello.c:14:    printf("Hello World\n");                                         
txt:1:hello everyone.     

 

cut [options] [files]

cut  [-bn] [file] 或 cut [-c] [file]  或  cut [-df] [file]

/var/root # cut -b 3-5,8 txt                                                    
llov                                                                            
is                                                                              
e b                                                                             

/var/root # cut -d "f" -f2 txt                                                  
hello everyone.                                                                 
ile.                                                                            
bye bye ...                                                                     

 

IFS 为linux默认分割符号

/var/root # echo "start${IFS}end"                                               
start                                                                           
end