Unix/Linux命令行小技巧（16）- ls命令显示以大写字母作为文件名开头的文件

使用“ls /path/to/[[:upper:]]*”命令可以显示以大写字母作为文件名开头的文件。
举个例子：

[root@localhost /]# ls /usr/bin/[[:upper:]]*
/usr/bin/AtoB            /usr/bin/GenIssuerAltNameExt   /usr/bin/PKCS12Export
/usr/bin/AuditVerify     /usr/bin/GenSubjectAltNameExt  /usr/bin/POST
/usr/bin/BtoA            /usr/bin/GET                   /usr/bin/PrettyPrintCert
/usr/bin/CMCEnroll       /usr/bin/HEAD                  /usr/bin/PrettyPrintCrl
/usr/bin/CMCRequest      /usr/bin/HtFileType            /usr/bin/RSA_SecurID_getpasswd
/usr/bin/CMCResponse     /usr/bin/HttpClient            /usr/bin/RunSimTest
/usr/bin/CMCRevoke       /usr/bin/IBMgtSim              /usr/bin/TokenInfo
/usr/bin/CRMFPopClient   /usr/bin/Mail                  /usr/bin/X
/usr/bin/ExtJoiner       /usr/bin/OCSPClient            /usr/bin/Xorg
/usr/bin/GenExtKeyUsage  /usr/bin/PKCS10Client

技巧出处：https://twitter.com/nixcraft/status/275006059209424896。