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[root@redhat ~]# which ¿ÉÖ´ÐÐÎļþÃû³Æ
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[root@redhat ~]# which passwd
/usr/bin/passwd
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[root@redhat ~]# whereis [-bmsu] Îļþ»òÕßĿ¼Ãû³Æ
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-b £º Ö»ÕÒ¶þ½øÖÆÎļþ
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-s £º Ö»ÕÒsourceÔ´Îļþ
-u £º ûÓÐ˵Ã÷ÎĵµµÄÎļþ
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[root@redhat ~]# whereis passwd
passwd: /usr/bin/passwd /etc/passwd /usr/share/man/man1/passwd.1.gz /usr/share/man/man5/passwd.5.gz
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[root@redhat ~]# whereis -b passwd
passwd: /usr/bin/passwd /etc/passwd
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[root@redhat ~]# locate Îļþ»òÕßĿ¼Ãû³Æ
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[root@redhat ~]# locate passwd
/home/weblogic/bea/user_projects/domains/zhanggongzhe112/myserver/stage/_appsdir_DB_war/DB.war/jsp/as/user/passwd.jsp
/home/weblogic/bea/user_projects/domains/zhanggongzhe112/myserver/stage/_appsdir_admin_war/admin.war/jsp/platform/passwd.jsp
/lib/security/pam_unix_passwd.so
/lib/security/pam_passwdqc.so
/usr/include/rpcsvc/yppasswd.x
/usr/include/rpcsvc
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#include <stdio.h>
#include <regex.h>
int main(int argc, char** argv)
{
regex_t reg;
regmatch_t pm[10];
char *pattern;
char buf[50];
const size_t nmatch = 10;
pattern = argv[1];
int result = regcomp(®, pattern, REG_EXTENDED);
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