linux文件权限chmod

chmod [ugoa]

u:user, g:group, o:other, a: all

read(r):4, write(w):2, execute(x):1

eg:

chmod 777 ./exe1

chmod 755 ./exe1

chmod u+x, g-x, o-x ./exe1

chmod ug+x, o-x ./exe1

chmod ug=rwx, o=r ./exe1