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${parameter-default}, ${parameter:-default}${parameter-default} -- 如果变量parameter没被声明, 那么就使用默认值.${parameter:-default} -- 如果变量parameter没被设置, 那么就使用默认值. ${parameter=default}, ${parameter:=defaul

AUTHOR: Archaic archaic@remove-this.indy.rr.com>DATE: 2003-09-28LICENSE: GNU Free Documentation License http://www.gnu.org/licenses/fdl.txtSYNOPSIS: Explanation of timezones, UTC, and the TZ env

The sysklogd script invokes the syslogd program with the -m 0 option. This option turns off the periodic timestamp mark that syslogd writes to the log files every 20 minutes by default. If you want to

LC_ALL= locale languageLC_ALL= locale charmapLC_ALL= locale int_curr_symbolLC_ALL= locale int_prefix   cat > /etc/profile # Begin /etc/profileexport LANG=_.# End /etc/profileEOF

cat > /etc/inputrc # Begin /etc/inputrc# Modified by Chris Lynn # Allow the command prompt to wrap to the next lineset horizontal-scroll-mode Off# Enable 8bit inputset meta-flag Onset input-meta On# T

cat /etc/udev/rules.d/70-persistent-net.rules  SUBSYSTEM=="net" - This tells Udev to ignore devices that are not network cards. ACTION=="add" - This tells Udev to ignore this rule for

mount命令详解功能：加载指定的文件系统。语法：mount [-afFhnrvVw] [-L] [-o] [-t] [设备名] [加载点]用法说明：mount可将指定设备中指定的文件系统加载到Linux目录下（也就是装载点）。可将经常使用的设备写入文件/etc/fastab,以使系统在每次启动时自动加载。mount加载设备的信息记录在/etc/mtab文件中。使用umount命令卸载设备时，记录