??????????
????????????????????????У?
????cd -
??????????????????????????
????cd
????????CDPATH??????????????·????
????export CDPATH=/var/www:/nas10
?????????????????cd */var/www/html/ ????????????????????????????????? /var/www/html??
????cd html
??????less?????????
????????????????less?????????????????v????????????$EDITOR?????????????????
????less *.c
????less foo.html
????## ????v????????? ##
????## ???????????????????less????? ##
?????г??????е????????????
??????????????е????????????У?
????find / -type d | less
????# ?г?$HOME ??????
????find $HOME -type d -ls | less
????????????е?????????У?
????find / -type f | less
????# ?г? $HOME ?????е????
????find $HOME -type f -ls | less
???????????????????
???????????mkdir????-p?????δ????????????
????mkdir -p /jail/{dev??bin??sbin??etc??usr??lib??lib64}
????ls -l /jail/
?????????????????????
???????????У?
????cp /path/to/file /usr/dir1
????cp /path/to/file /var/dir2
????cp /path/to/file /nas/dir3
??????????????????????????????????У?
????echo /usr/dir1 /var/dir2 /nas/dir3 |  xargs -n 1 cp -v /path/to/file
???????′??????shell?????????????????
?????????????????????
????diff??????б????????????????????????????
????ls -l /tmp/r
????ls -l /tmp/s
????# ??? diff ????????????
????diff /tmp/r/ /tmp/s/


??
???? ???????????

????????????
???????????fmt?????????????????????????У?????÷???????в????????У?
????fmt file.txt
????????????????У?????????????????????У???????????У?
????fmt -s file.txt
????????????????????д??????????
???????????tee??????????????????????д????????my.log?У?
????mycoolapp arg1 arg2 input.file | tee my.log
????tee????????????????????mycoolapp???????д?????  my.log??