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1> ʹÓÃCDPATHÉèÖà cd ÃüÁîµÄ¹¤×÷Ŀ¼
[ramesh@dev-db ~]# pwd 
/home/ramesh 
[ramesh@dev-db ~]# cd mail 
-bash: cd: mail: No such file or directory 
[×¢Ò⣺ÔÚµ±Ç°Ä¿Â¼ÏÂѰÕÒMAILĿ¼] 
[ramesh@dev-db ~]# export CDPATH=/etc 
[ramesh@dev-db ~]# cd mail /etc/mail 
[×¢Ò⣺ÕâÊÇÔÚ/etcÏÂѰÕÒMAILĿ¼] 
[ramesh@dev-db /etc/mail]# pwd 
/etc/mail 
ÏëÒªÕâ¸öÉèÖÃÓÀ¾ÃÉúЧ, °Ñexport CDPATH=/etc Ìí¼Óµ½ÄãµÄ.bash_profileÖС£
2> ʹÓÃcd ±ðÃû(alias)À´¸üÓÐЧµÄ·µ»ØÉϲãĿ¼
# mkdir -p /tmp/very/long/directory/structure/that/is/too/deep 
# cd /tmp/very/long/directory/structure/that/is/too/deep 
# pwd /tmp/very/long/directory/structure/that/is/too/deep 
# cd ../../../../
Ìí¼ÓÈçÏÂ
alias cd1="cd .." 
alias cd2="cd ../.." 
alias cd3="cd ../../.." 
alias cd4="cd ../../../.." 
alias cd5="cd ../../../../.."
µ½ÄãµÄ.bash_profileÖк󣬾ͿÉÒÔÈçÏ»ص½Éϲã/ÉÏÉϲã/ÉÏÉÏÉϲãĿ¼ÁË  :)
# cd /tmp/very/long/directory/structure/that/is/too/deep
# cd4
# pwd
/tmp/very/long/directory/structure/


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