为了技术，我不会停下学习的脚步，我相信我还能走二十年。
分类：
2012-07-06 18:23:14
原文地址：SHELL相关积累 作者：g_programming
目录
5. If [ “X$v1” == “X$v2” ]；参数都应被””
6. #!/bin/bash – 阻止shell设置IFS和PATH
2. 日期转天数 （计算距离1970-01-01 00:00:00的天数）
1. 获取文件夹名/root/home (/root/home/tt.txt)
2. 获取文件名tt.txt (/root/home/tt.txt)
cat << EOF this is a line EOF
[]*\.-]
str=’mkdir /root/tt’;eval $str
str=’mkdir /root/tt’ | echo $str | sh -x
sed ${n:-25}q
；参数都应被””
阻止shell设置IFS和PATH
echo {a,b,c,e,f}{1,2,3}
|
${!varprefix*}间接引用 |
匹配之前所有以varprefix开头进行声明的变量 |
|
${!varprefix@}间接引用 |
匹配之前所有以varprefix开头进行声明的变量 |
if [[ "${array[@]}" =~ $str ]] # 不匹配 ![[ "${array[@]}" =~ $str ]]
将变量传给shell可以用eval
eval $(awk 'BEGIN{print "a=ggg b=3"}')
然后
echo $a;echo $b
测试一下
#!/bin/sh
F="xxxx.ftp"
echo "open 192.168.7.51 21" > $F
echo "user username passwd" >> $F
echo "bin" >> $F
echo "cd /home/xxx/" >> $F
echo "mput $1" >> $F
echo "bye" >> $F
ftp -i -in < $F
rm -rf $F
#!/bin/sh
( echo sybase
sleep 2
echo sybase
sleep 3
echo "\n"
sleep 2
echo "ps "
sleep 2
echo logout ) | telnet alpha
while read t1 t2 t3 t4
do
echo $t2 $t4
sed 's/.*/sed eat the line ( & )/'
done
15.
function date2week {
echo "$1 $2 $3" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
dow=(int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472629)%7;
print dow
}'
}
1970-01-01 00:00:00的天数）
（1）date +%s | awk '{print int($0/60/60/24)}'
（2）function date2days {
echo "$*" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
print j
}'
}
date2days `echo "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`
function days2date {
echo "$1" | awk '{
a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
printf ("%4d-%02d-%02d\n",yy,mm,dd)
}'
}
days2date 14839
（1）date +%s | awk '{print int($0/60)}'
（2）function date2minutes {
echo "$*" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
j=j*1440+$4*60+$5
print j
}'
}
date2minutes `echo "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`
function minutes2date {
echo "$1" | awk '{
i=$1; nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); i=int(i/24);
a=i+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
printf ("%4d-%02d-%02d %02d:%02d\n",yy,mm,dd,hh,nn)
}'
}
minutes2date 21369299
（1）date +%s
（2）function date2seconds {
echo "$*" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
j=j*86400+$4*3600+$5*60+$6
print j
}'
}
date2seconds `echo "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`
function seconds2date {
echo "$1" | awk '{
i=$1; ss=i%60; i=int(i/60); nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); i=int(i/24);
a=i+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
printf ("%4d-%02d-%02d %02d:%02d:%02d\n",yy,mm,dd,hh,nn,ss)
}'
}
seconds2date 1282157959
（1）date +%s | awk '{print int($0*1000)}'
（2）function date2milliseconds {
echo "$*" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
j=j*86400+$4*3600+$5*60+$6
printf ("%d%s\n",j,$7)
}'
}
date2milliseconds `echo "2010-08-18 18:59:19.073" | sed 's/-/ /g;s/:/ /g;s/\./ /g'`
function milliseconds2date {
echo "$1" | awk '{
i=$1; ms=i%1000; i=int(i/1000); ss=i%60; i=int(i/60); nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24);
i=int(i/24);
a=i+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
printf ("%4d-%02d-%02d %02d:%02d:%02d.%03d\n",yy,mm,dd,hh,nn,ss,ms)
}'
}
milliseconds2date 1282157959073
（1）[[ `date -d'20101050' &>/dev/null` ]] && echo ok||echo no
（2）function date2days {
echo "$*" | awk '{
z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
print j
}'
}
function days2date {
echo "$1" | awk '{
a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
printf ("%4d%02d%02d\n",yy,mm,dd)
}'
}
num1=20105050
num2=20101001
arg1=`echo "$num1" | sed -r 's/(....)(..)(..)/\1 \2 \3/g'`
arg2=`echo "$num2" | sed -r 's/(....)(..)(..)/\1 \2 \3/g'`
days1=`date2days $arg1`
date1=`days2date $days1`
days2=`date2days $arg2`
date2=`days2date $days2`
[ "$num1" -eq "$date1" ] && echo "$num1 is valid date" || echo "$num1 is invalid date"
[ "$num2" -eq "$date2" ] && echo "$num2 is valid date" || echo "$num2 is invalid date"
11.
12.
${path%/*}
${path##/*/}
