1.定时输入
一、
#! /bin/shTIMEOUT=3TIMELIMIT=3printAnswer(){ if [ "$answer" = TIMEOUT ] then echo $answer else echo "Your favorite veggie is $answer" kill $! fi}
timerOn(){ sleep $TIMELIMIT && kill -s 14 $$ & ----??}
Int14Vector(){ answer="TIMEOUT" printAnswer exit 14}
trap int14Vector 14 -----???echo "What is your favorite vegetable "timerOnread answerprintAnswerexit 0
二、
#! /bin/shINTERVAL=5timeout_read() { timeout=$1 varname=$2 old_tty_settings=`stty -g` ---保存当前stty状态到 old_tty_settings stty -icanon min 0 time ${timeout}0 -----禁用规范输入 eval read $varname --------接受键盘输入s}
echo; echo -n "What's your name? Quick! "timeout_read $INTERVAL your_name
echo
if [ ! -z "$your_name" ]then echo "Your name is $your_name."else echo "Timed out."fi
echo
exit 0
三、
#! /bin/shTIMELIMIT=4read -t $TIMELIMIT variable ----------在指定时间内输入信息echo
if [ -z "$variable" ]then echo "Timed out,variable still unset."else echo "variable = $variable"fi
exit 0
四、判断是否是root用户
[root@localhost yjg]# id -nuroot[root@localhost yjg]# iduid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=root:system_r:unconfined_t[root@localhost yjg]# vi 9-5.sh
#! /bin/shROOT_UID=0if [ "$UID" -eq "$ROOT_UID" ]then echo "You are root."else echo "You are just an ordinary user (but mom loves you just the same)."fi
ROOTUSER_NAME=rootusername=`id -nu`if [ "$username" = "$ROOTUSER_NAME" ]then echo "Rooty,toot,toot. You are root."else echo "You are just a regular fella."fi
exit 0
五、通过$*和$@列出所有的参数
#! /bin/shE_BADARGS=65if [ ! -n "$1" ]then echo "Uage: `basename $0` argument1 argument2 etc." exit "$E_BADARGS"fi
echo
index=1echo "Listing args with /"/$*/":"for arg in "$*"do echo "Arg #$index = $arg" let "index+=1"done
echo "Enter arg list seen as single word."
echo
index=1echo "Listing args with /"/$@/":"for arg in "$@"do echo "Arg #$index = $arg" let "index+=1"doneecho "Arg list seen as separate words."
echo
index=1echo "Listing args with /$* (unquoted):"for arg in $*do echo "Arg #$index = $arg" let "index+=1"done
echo "Arg list seen as separate words."exit 0
