bash 如果 grep 值大于 1000 那么
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if grep value greater than 1000 then
提问by user3022917
I want to grep "priority=" in a file where the value of "priority=" is greater than 1000.
我想在“priority=”的值大于 1000 的文件中搜索“priority=”。
I tried something like this:
我试过这样的事情：
if grep -q "priority=[ >1000 ]" file; then
echo "[!] Unnatural priority"
fi
e.g. <intent-filter android:priority="2147483647">
例如 <intent-filter android:priority="2147483647">
回答by jm666
Try:
尝试：
(( $(grep -oP 'priority\s*=\s*"\s*\K(\d+)' file) > 1000 )) && echo "warning"
Need a relatively new grep with -Pperl regex support. The:
需要一个具有-Pperl 正则表达式支持的相对较新的 grep 。这：
\K(variable look behind) matches, but kills everything before it from the result, so it prints only the capture group(\d+)
\K(variable look behind) 匹配，但从结果中杀死它之前的所有内容，因此它仅打印捕获组(\d+)
of course, you can use perl too,
当然，你也可以使用 perl，
perl -nlE 'say if /priority="\K(\d+)/' <<< '<intent-filter android:priority="2147483647">'
prints
印刷
2147483647
or sed
或 sed
sed 's/.*priority="\([0-9][0-9]*\).*//' <<< '<intent-filter android:priority="2147483647">'
回答by Tom Fenech
You could use this Perl one-liner:
你可以使用这个 Perl one-liner：
perl -lne 'print "[!] Unnatural priority" if /priority="(\d+)"/ && > 1000'
Capture the digits in priority="X" and print the warning if the value is greater than 1000.
捕获 priority="X" 中的数字并在值大于 1000 时打印警告。
You can also do this in native bash if you want:
如果需要，您也可以在本机 bash 中执行此操作：
while read -r line; do
if [[ $line =~ priority=\"([[:digit:]]+)\" ]] && (( BASH_REMATCH[1] > 1000 )); then
echo "[!] Unnatural priority"
fi
done < file
回答by Bobulous
You could try using a regular expression to require a pattern that resembles a number greater than one thousand:
您可以尝试使用正则表达式来要求类似于大于一千的数字的模式：
grep -q --regexp="priority=\"[1-9][0-9]\{3,\}\"" file
This should match the case where priority=is followed by at least four digits and the first digit is non-zero.
这应该与priority=后面至少有四位数字且第一位非零的情况相匹配。
回答by Simon Woodside
awkwill make this easy:
awk将使这变得容易：
$ cat file | awk -F '=' ' > 1000 {print ##代码##}'
Assuming that there's only one =on each line of course.
当然，假设=每一行只有一个。
