如何计算 BASH 数组中的项目出现次数？
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时间：2020-09-18 05:01:15 来源:igfitidea点击:
How to count item occurences in BASH array?
提问by minerals
I have an array ${myarr[@]}with strings. ${myarr[@]}basically consists of lines and each line constists of words.
我有一个${myarr[@]}带字符串的数组。${myarr[@]}基本上由行组成，每行由单词组成。
world hello moon
weather dog tree
hello green plastic
I need to count the occurences of helloin this array.
How do I do it?
我需要计算hello这个数组中的出现次数。我该怎么做？
回答by anishsane
Alternative (without loop):
替代方案（无循环）：
grep -o hello <<< ${myarr[*]} | wc -l
回答by cdarke
No need for an external program:
无需外部程序：
count=0
for word in ${myarr[*]}; do
if [[ $word =~ hello ]]; then
(( count++ ))
fi
done
echo $count
回答by Ansgar Wiechers
Try this:
尝试这个：
for word in ${myarr[*]}; do
echo $word
done | grep -c "hello"
