Bash有条件地删除行尾

我试图从日志文件中的特定行中删除行尾。目标是从匹配的行中删除行尾，然后将这些行附加到与删除行尾条件不匹配的前一行

日志示例：

[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message

[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message

示例输出：

[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
Log Message Overflowing
Log Message Overflowing
Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message

[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message

我不确定什么是最好的方法，我也有过一些困难，通过sed有条件地删除行结尾

可能在每条线路上循环是最好的方式

这就是我想出来的，它是有效的，我只是认为会有一个更好的不太复杂/不太线性的方法

#!/bin/bash
PrevNoMatchLine=""
PrevMatchLine=""
while read -r line; do 
    if [[ $line =~ ^[^\[] ]]; then
        PrevMatchLine+="$line "
    else
        if [[ $PrevMatchLine ]]; then
            PrevNoMatchLine+=" $PrevMatchLine"
            PrevMatchLine=""
            echo $PrevNoMatchLine
        else
            PrevNoMatchLine=$line
        fi
        echo $line 
    fi
done < test.log

#/bin/bash
PrevNoMatchLine=“”
PrevMatchLine=“”
而read-r行；做
如果[[$line=~^[^\[]]；则
PrevMatchLine+=“$line”
其他的
如果[[$PrevMatchLine]]；则
PrevNoMatchLine+=“$PrevMatchLine”
PrevMatchLine=“”
echo$PrevNoMatchLine
其他的
PrevNoMatchLine=$line
fi
回音$线
fi
完成

您可以使用awk：

awk '{if ($0 ~ /^\[/) {if (p) print p; p=$0} else p = p " " $0} END{print p}' file.log

[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message Log Message Overflowing Log Message Overflowing Log Message Overflowing
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message
[username] [object] [ip address] [datetime] [pid] :>MESSAGE TYPE:Message