如何使用 bash 脚本和 sed 用换行符替换字符串？
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How do I replace a string with a newline using a bash script and sed?
提问by Kevin Custer
I have the following input:
我有以下输入：
Value1|Value2|Value3|Value4@@ Value5|Value6|Value7|Value8@@ Value9|etc...
In my bash script I would like to replace the @@ with a newline. I have tried various things with sed but I'm not having any luck:
在我的 bash 脚本中，我想@@ 用换行符替换。我用 sed 尝试了各种方法，但我没有任何运气：
line=$(echo ${x} | sed -e $'s/@@ /\\n/g')
Ultimately I need to parse this whole input into rows and values. Maybe I am going about it wrong. I was planning to replace the @@ with newlines and then loop through the input with setting IFS='|'to split up the values. If there is a better way please tell me, I am still a beginner with shell scripting.
最终我需要将整个输入解析为行和值。也许我的做法是错误的。我打算@@ 用换行符替换，然后使用设置循环输入IFS='|'以拆分值。如果有更好的方法请告诉我，我仍然是 shell 脚本的初学者。
回答by prudviraj
This will work
这将工作
sed 's/@@ /\n/g' filename
replaces @@with new line
替换@@为新行
回答by anubhava
Using pure BASH string manipulation:
使用纯 BASH 字符串操作：
eol=$'\n'
line="${line//@@ /$eol}"
echo "$line"
Value1|Value2|Value3|Value4
Value5|Value6|Value7|Value8
Value9|etc...
回答by itzhaki
回答by Kevin Custer
Finally got it working with:
终于让它与：
sed 's/@@ /'\\n'/g'
Adding the single quotes around \\n seemed to help for whatever reason
无论出于何种原因，在 \\n 周围添加单引号似乎都有帮助
回答by Victor Henriquez
If you don't mind to use perl:
如果您不介意使用 perl：
echo $line | perl -pe 's/@@/\n/g'
Value1|Value2|Value3|Value4
Value5|Value6|Value7|Value8
Value9|etc
回答by Tripp Kinetics
How about:
怎么样：
for line in `echo $longline | sed 's/@@/\n/g'` ; do
$operation1 $line
$operation2 $line
...
$operationN $line
for field in `echo $each | sed 's/|/\n/g'` ; do
$operationF1 $field
$operationF2 $field
...
$operationFN $field
done
done
回答by Brad Parks
This wraps up using perl to do it, and gives some simple help.
这结束了使用 perl 来完成它，并提供了一些简单的帮助。
$ echo "hi\nthere"
hi
there
$ echo "hi\nthere" | replace_string.sh e
hi
th
re
$ echo "hi\nthere" | replace_string.sh hi
there
$ echo "hi\nthere" | replace_string.sh hi bye
bye
there
$ echo "hi\nthere" | replace_string.sh e super all
hi
thsuperrsuper
replace_string.sh
替换字符串.sh
#!/bin/bash
ME=$(basename ##代码##)
function show_help()
{
IT=$(cat <<EOF
replaces a string with a new line, or any other string,
first occurrence by default, globally if "all" passed in
usage: $ME SEARCH_FOR {REPLACE_WITH} {ALL}
e.g.
$ME : -> replaces first instance of ":" with a new line
$ME : b -> replaces first instance of ":" with "b"
$ME a b all -> replaces ALL instances of "a" with "b"
)
echo "$IT"
exit
}
if [ "" == "help" ]
then
show_help
fi
if [ -z "" ]
then
show_help
fi
STRING=""
TIMES=${3:-""}
WITH=${2:-"\n"}
if [ "$TIMES" == "all" ]
then
TIMES="g"
else
TIMES=""
fi
perl -pe "s/$STRING/$WITH/$TIMES"
