最近在學(xué)習(xí)sed和awk時(shí)，發(fā)現(xiàn)了一本入門級(jí)別的好書(shū)：《Software Design 中文版 03》。
我們這里的日歷程序也是從那里得來(lái)，這里強(qiáng)烈推薦希望了解sed和awk的同志們?nèi)胧直緯?shū)。
# 在shell中生成日歷
# 使用方式
# awk -f thisFile +2017
# awk -f thisFile +2017.10
# awk -f thisFile +2017.10.10
#
function whichWeek(y, m, d, s) {
s = 0
if (((y%4 == 0) (y%100 != 0)) || (y%400 == 0)) if (M[2] == 28) M[2]++
if (y>0) s += --y + int(y/4) - int(y/100) + int(y/400)
while (m > 1) s += M[--m]
return (s+d)%7
}
function printCalendar(y, m, d, nowWeek, i){
printf("%d%s %d%s\n", y, "年", m, "月")
print "日 一 二 三 四 五 六 "
printf("%s", repeat(" ", ((nowWeek+1)%7)*3))
for (i=1; i=M[m]; i++) {
if ((nowWeek+i) % 7 != 6) {
printf("%2d ", i)
} else {
printf("%2d \n", i)
}
}
print "\n"
}
function repeat(flag, time, i, str){
for (i=0; itime; i++) {
str = str flag
}
return str
}
function option(opt) {
if (ARGC > 1 ARGV[1] ~ /^\+.*$/) {
print ARGC, ARGV[1]
opt = substr(ARGV[1], 2)
delete ARGV[1]
}
return opt
}
BEGIN {
M[1] = 31
M[2] = 28
M[3] = 31
M[4] = 30
M[5] = 31
M[6] = 30
M[7] = 31
M[8] = 31
M[9] = 30
M[10] = 31
M[11] = 30
M[12] = 31
W[0] = "日"
W[1] = "一"
W[2] = "二"
W[3] = "三"
W[4] = "四"
W[5] = "五"
W[6] = "六"
split(option(), date, ".")
nowWeek = whichWeek(date[1]+0, date[2]+0, date[3]+0)
if (date[3] != "") {
print "星期" W[nowWeek]
} else if (date[2] != "") {
printCalendar(date[1]+0, date[2]+0, M[date[2]], nowWeek)
} else {
for (j=1; j=12; j++) {
printCalendar(date[1]+0, j, M[i], whichWeek(date[1]+0, j, 0))
}
}
}
