bash IF 语句中的 grep
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grep in IF statement
提问by ErAB
The following script portion read each line in $next. But when I try to grep particular pattern i.e. "MO"in $next, the error is shown on standard output as:
以下脚本部分读取$next. 但是当我尝试 grep 特定模式 ie "MO"in 时$next，错误在标准输出中显示为：
grep: 40922|OPR: No such file or directory
grep: MO: No such file or directory
grep: 12345|OPR: No such file or directory
grep: MO: No such file or directory
grep: 12345|12345|202|local|LMNO: No such file or directory
cat /home/scripts/$E1.out | while read next
do
i=`echo $next | awk -F"|" '{print()}'`
j=`echo $next | awk -F"|" '{print()}'`
k=`echo $next | awk -F"|" '{print()}'`
l=`echo $next | awk -F"|" '{print()}'`
m=`echo $next | awk -F"|" '{print()}'`
n=`echo $next | awk -F"|" '{print()}'`
o=`echo $next | awk -F"|" '{print()}'`
if grep -q "MO" $next
then echo "FOUND;" >> /home/scripts/sql.$E1.out
else echo "NOT FOUND;" >> /home/scripts/sql.$E1.out
fi
done
$E1.outfiles looks like :
$E1.out文件看起来像：
40922|OPR MO 12345|OPR MO 12345|12345|202|local|LMNO
回答by Brian Campbell
The argument you pass in to grep, $next, is being treated as a list of filenames to search through. If you would like to search within that line for a string, say, MO, then you need to either put it in a file and pass that file in as an argument, or pipe it in via standard input.
您传递给grep,的参数$next被视为要搜索的文件名列表。如果您想在该行中搜索字符串，例如，，MO那么您需要将其放入一个文件中并将该文件作为参数传入，或者通过标准输入将其输入。
Here's an example that you can try out on the command line; of course, substitute the variable that you're using for the literal value that I included to illustrate:
这是您可以在命令行上试用的示例；当然，将您使用的变量替换为我用于说明的文字值：
if echo "40922|OPR MO 12345|OPR MO 12345|12345|202|local|LMNO" | grep -q "MO"
then echo "FOUND"
else echo "NOT FOUND"
fi
回答by ghostdog74
if grep -q "MO" ${E1}.out then
echo "found"
else
echo "not found"
fi
回答by Sreesankar
if tmux ls | grep -q "ABC"; then echo "1"; else echo "2"; fi
