Bash

在bash中的值之後生成隨機數

  • March 16, 2018

我希望我的機器自動下載一些文件。這不一定非常有效。所以我決定用 bash 腳本來做這件事。

到目前為止,當我幾乎不編碼 URL 時,它仍然有效。但我想以不規則的順序檢索文件,我想我會使用簡單的變數。如何將隨機數放入我的變數中?

我的方法

data_link0="https://example.com/target1.html"
data_link1="https://example.com/target2.html"
data_link2="https://example.com/target3.html"
data_link3="https://example.com/target4.html"

useragent0="Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1"
useragent1="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/604.5.6 (KHTML, like Gecko) Version/11.0.3 Safari/604.5.6"
useragent3="Mozilla/5.0 (Windows 7; ) Gecko/geckotrail Firefox/firefoxversion"

wget --user-agent="$user_agent[$((RANDOM % 3))]" "$datei_link$((RANDOM % 3))"

不幸的是不起作用。

至於您需要檢索所有 url,更好的方法是使用shuf (GNU/linux coreutils) (或sort -Rcoreutils):

shuf file | xargs wget

文件 :

$ cat file
"https://example.com/target1.html"
"https://example.com/target2.html"
"https://example.com/target3.html"
"https://example.com/target4.html"

man 1 shuf

姓名

shuf - 生成隨機排列


新評論、新需求、新程式碼:

(需要隨機使用者代理)

$ cat uas
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36 OPR/15.0.1147.100
Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; AS; rv:11.0) like Gecko

程式碼 :

shuf file | while read url; do
   wget --user-agent="$(shuf -n1 uas)" "$url"
done

如果您喜歡保持自己的方式(一個網址):

data_link=(
   "https://example.com/target1.html"
   "https://example.com/target2.html"
   "https://example.com/target3.html"
   "https://example.com/target4.html"
)
user_agent=(
   "Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1"
   "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/604.5.6 (KHTML, like Gecko) Version/11.0.3 Safari/604.5.6"
   "Mozilla/5.0 (Windows 7; ) Gecko/geckotrail Firefox/firefoxversion"
)

wget --user-agent="${user_agent[RANDOM % ${#user_agent[@]} ]}" "${data_link[RANDOM % ${#data_link[@]}]}"

您對所有網址和使用者代理的方式(都是隨機的):

for i in $(seq 0 $((${#data_link[@]} -1)) | shuf); do
   wget -U "${user_agent[RANDOM % ${#user_agent[@]}]}" "${data_link[i]}"
done

引用自:https://unix.stackexchange.com/questions/430056