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24.6.1 »²¾È²ÄǽÀ­¤Î¸¡ºº

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Function: file-exists-p filename

¥Õ¥¡¥¤¥ëfilename¤¬Â¸ºß¤¹¤ì¤Ð¡¢¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£ ¤³¤ì¤Ïɬ¤º¤·¤â¥Õ¥¡¥¤¥ë¤òÆÉ¤á¤ë¤³¤È¤Ï°ÕÌ£¤»¤º¡¢ ñ¤Ë¥Õ¥¡¥¤¥ë¤Î°À­¤òÄ´¤Ù¤é¤ì¤ë¤À¤±¤Ç¤¢¤ë¡£ ¡ÊUNIX¤Ç¤Ï¡¢¥Õ¥¡¥¤¥ë¤¬Â¸ºß¤·¡¢¤«¤Ä¡¢ ¤½¤ì¤ò¼ý¤á¤¿¥Ç¥£¥ì¥¯¥È¥ê¤ËÂФ¹¤ë¼Â¹Ô¥Ñ¡¼¥ß¥Ã¥·¥ç¥ó¤¬¤¢¤ì¤Ð¡¢ ¥Õ¥¡¥¤¥ë¼«ÂΤΥѡ¼¥ß¥Ã¥·¥ç¥ó¤Ë´Ø·¸¤Ê¤¯¤³¤Î¤è¤¦¤Ë¤Ê¤ë¡£¡Ë

¥Õ¥¡¥¤¥ë¤¬Â¸ºß¤·¤Ê¤«¤Ã¤¿¤ê¡¢¥Õ¥¡¥¤¥ë¤Î°À­¤òõ¤¹¸¢¸Â¤¬¤Ê¤±¤ì¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ïnil¤òÊÖ¤¹¡£

Function: file-readable-p filename

¥Õ¥¡¥¤¥ëfilename¤¬Â¸ºß¤·¤½¤ì¤òÆÉ¤à¤³¤È¤¬¤Ç¤­¤ë¤Ê¤é¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£ ¤µ¤â¤Ê¤±¤ì¤Ðnil¤òÊÖ¤¹¡£

(file-readable-p "files.texi")
     ⇒ t
(file-exists-p "/usr/spool/mqueue")
     ⇒ t
(file-readable-p "/usr/spool/mqueue")
     ⇒ nil
Function: file-executable-p filename

¥Õ¥¡¥¤¥ëfilename¤¬Â¸ºß¤·¤½¤ì¤ò¼Â¹Ô¤Ç¤­¤ë¤Ê¤é¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£ ¤µ¤â¤Ê¤±¤ì¤Ðnil¤òÊÖ¤¹¡£ ¥Õ¥¡¥¤¥ë¤¬¥Ç¥£¥ì¥¯¥È¥ê¤Ç¤¢¤ë¾ì¹ç¡¢¼Â¹Ô¥Ñ¡¼¥ß¥Ã¥·¥ç¥ó¤Ï¡¢ ¥Ç¥£¥ì¥¯¥È¥êÆâ¤Î¥Õ¥¡¥¤¥ë¤Î¸ºß¤ä¤½¤Î°À­¤ò¸¡ºº¤Ç¤­¡¢ ¤½¤ì¤é¤Î¥Õ¥¡¥¤¥ë¤Î¥â¡¼¥É¤¬µö¤»¤Ð¥ª¡¼¥×¥ó¤Ç¤­¤ë¤³¤È¤ò°ÕÌ£¤¹¤ë¡£

Function: file-writable-p filename

¥Õ¥¡¥¤¥ëfilename¤Ë½ñ¤­½Ð¤·¤¿¤êºîÀ®¤Ç¤­¤ë¤Ê¤é¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤·¡¢¤µ¤â¤Ê¤±¤ì¤Ðnil¤òÊÖ¤¹¡£ ¥Õ¥¡¥¤¥ë¤Ë½ñ¤­½Ð¤»¤ë¤Î¤Ï¡¢¥Õ¥¡¥¤¥ë¤¬Â¸ºß¤·½ñ¤±¤ë¾ì¹ç¤Ç¤¢¤ë¡£ ºîÀ®¤Ç¤­¤ë¤Î¤Ï¡¢¥Õ¥¡¥¤¥ë¤Ï¸ºß¤·¤Ê¤¤¤¬ »ØÄꤷ¤¿¥Ç¥£¥ì¥¯¥È¥ê¤¬Â¸ºß¤·¤½¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Ë½ñ¤±¤ë¾ì¹ç¤Ç¤¢¤ë¡£

°Ê²¼¤Î3ÈÖÌܤÎÎã¤Ç¤Ï¡¢foo¤Î¿Æ¥Ç¥£¥ì¥¯¥È¥ê¤¬Â¸ºß¤·¤Ê¤¤¤Î¤Ç¡¢ ¤¿¤È¤¨¥Ç¥£¥ì¥¯¥È¥ê¤òºîÀ®¤Ç¤­¤ë¤È¤·¤Æ¤âfoo¤Ï½ñ¤±¤Ê¤¤¡£

(file-writable-p "~/foo")
     ⇒ t
(file-writable-p "/foo")
     ⇒ nil
(file-writable-p "~/no-such-dir/foo")
     ⇒ nil
Function: file-accessible-directory-p dirname

¥Ç¥£¥ì¥¯¥È¥êdirname¤Î´û¸¥Õ¥¡¥¤¥ë¤ò¥ª¡¼¥×¥ó¤¹¤ë¥Ñ¡¼¥ß¥Ã¥·¥ç¥ó¤¬¤¢¤ì¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£ ¤µ¤â¤Ê¤±¤ì¤Ð¡Ê¤¢¤ë¤¤¤ÏÅö³º¥Ç¥£¥ì¥¯¥È¥ê¤¬Â¸ºß¤·¤Ê¤±¤ì¤Ð¡Ënil¤òÊÖ¤¹¡£ dirname¤ÎÃͤϥǥ£¥ì¥¯¥È¥ê̾¤Ç¤¢¤ë¡£

Îã¡§ ¤Ä¤®¤ÎÎã¤Ç¤Ï¡¢

(file-accessible-directory-p "/foo")
     ⇒ nil

¤«¤é¡¢/foo/Æâ¤Î¥Õ¥¡¥¤¥ë¤òÆÉ¤â¤¦¤È¤¹¤ë¤È ¥¨¥é¡¼¤Ë¤Ê¤ë¤È¿äÏÀ¤Ç¤­¤ë¡£

Function: access-file filename string

¤³¤Î´Ø¿ô¤Ï¡¢¥Õ¥¡¥¤¥ëfilename¤òÆÉ¤à¤¿¤á¤Ë¥ª¡¼¥×¥ó¤·¡¢ ¥¯¥í¡¼¥º¤·¤Æ¤«¤énil¤òÊÖ¤¹¡£ ¤·¤«¤·¡¢¥ª¡¼¥×¥ó¤Ë¼ºÇÔ¤¹¤ë¤Èstring¤ò¥¨¥é¡¼¥á¥Ã¥»¡¼¥¸¤Î¥Æ¥­¥¹¥È¤È¤·¤¿ ¥¨¥é¡¼¤òÄÌÃΤ¹¤ë¡£

Function: file-ownership-preserved-p filename

¤â¤·¥Õ¥¡¥¤¥ëfilename¤òºï½ü¤·¤Æ²þ¤á¤ÆºîÀ®¤·¤Æ¤â ¥Õ¥¡¥¤¥ë¤Î½êÍ­¼Ô¤¬Êѹ¹¤µ¤ì¤Ê¤±¤ì¤Ð¡¢¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£

Function: file-newer-than-file-p filename1 filename2

¥Õ¥¡¥¤¥ëfilename1¤¬filename2¤è¤ê¿·¤·¤±¤ì¤Ð¡¢ ¤³¤Î´Ø¿ô¤Ït¤òÊÖ¤¹¡£ filename1¤¬Â¸ºß¤·¤Ê¤±¤ì¤Ðnil¤òÊÖ¤¹¡£ filename2¤¬Â¸ºß¤·¤Ê¤±¤ì¤Ðt¤òÊÖ¤¹¡£

°Ê²¼¤ÎÎã¤Ç¡¢¥Õ¥¡¥¤¥ëaug-19¤Ï19Æü¤Ë½ñ¤«¤ì¡¢ ¥Õ¥¡¥¤¥ëaug-20¤Ï20Æü¤Ë½ñ¤«¤ì¡¢ ¥Õ¥¡¥¤¥ëno-file¤Ï¸ºß¤·¤Ê¤¤¤È²¾Äꤹ¤ë¡£

(file-newer-than-file-p "aug-19" "aug-20")
     ⇒ nil
(file-newer-than-file-p "aug-20" "aug-19")
     ⇒ t
(file-newer-than-file-p "aug-19" "no-file")
     ⇒ t
(file-newer-than-file-p "no-file" "aug-19")
     ⇒ nil

file-attributes¤ò»È¤Ã¤Æ¡¢ 2¤Ä¤Î¿ô¤«¤éÀ®¤ë¥ê¥¹¥È¤È¤·¤Æ¥Õ¥¡¥¤¥ë¤ÎºÇ½ª¹¹¿·»þ¹ï¤ò¼èÆÀ¤Ç¤­¤ë¡£ see File Attributes¡£