bash sed 给出：sed：无法读取：没有这样的文件或目录
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Sed gives: sed: can't read : No such file or directory
提问by Bas van Dijk
I have the following bashscript which repeats for each image found. It needs to iterated over all html, cssand jsfiles, and replace all occurrences of an image within that file.
我有以下bash脚本，它为找到的每个图像重复。它需要遍历所有html、css和js文件，并替换该文件中所有出现的图像。
for image in app/www/images-theme-dark/*.png
do
echo "installing icon" $image
# extract filename from iconpath
iconfile=$(basename $image)
iconPath="images/"$(basename $image)
# replace paths in all files containing icon paths
find app/www -type f \( -name "*.html" -or -name "*.css" -or -name "*.js" \
-or -name "*.appcache" \) \
-exec sed -i '' -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}" \;
done
However when I run the script sedgives:
但是，当我运行脚本时sed：
sed: can't read : No such file or directory
sed: can't read : No such file or directory
On StackOverflow I've found sed: can't read : No such file or directoryBut I already had quotes around {}
在 StackOverflow 上，我发现sed: can't read : No such file or directory但我已经有了引号{}
When I echo the sedcommand and and execute it on the command line manually there is no error.
当我回显sed命令并在命令行上手动执行它时，没有错误。
I am using GNU sed v4.2.2 on Raspbian GNU/Linux 8.0 (jessie)
我在 Raspbian GNU/Linux 8.0 (jessie) 上使用 GNU sed v4.2.2
Does someone see what could be wrong here?
有人看到这里有什么问题吗？
回答by Yunnosch
(Compiling an answer from comments, the know-how is by melpomene and AlexP.)
（从评论中编译答案，诀窍是 melpomene 和 AlexP。）
What is that ''after sed -i?
那''之后是什么sed -i？
-imeans in-place, that is, edit in the file directly.-i ''means edit in place a file whose name is the empty string.
Since there probably is no file whose name is the empty string, sed complains that it cannot read it.
-i表示就地，即直接在文件中编辑。-i ''表示就地编辑名称为空字符串的文件。
由于可能没有名称为空字符串的文件，sed 抱怨它无法读取它。
Note 1 platform dependency:
The syntax of -iis one difference between GNU sed and sed from mac os.
注 1平台依赖性：
的语法-i是 GNU sed 和 mac os sed 之间的一个区别。
Note 2 "usual" order of arguments:
The -eswitch to indicate the sed code allows having it in between file names.
This is a trap (in which I for example got caught embarassingly), by making you trip over your expectations of what you find where in an sed command line.
It allowssed -i filename -e "expression" AnotherFileName
which is an unintentionally camouflaged version ofsed -i'NoExtensionGiven' "expression" filename AnotherFileName.
注意 2参数的“通常”顺序：指示 sed 代码
的-e开关允许将其置于文件名之间。
这是一个陷阱（例如，我在其中尴尬地陷入了困境），它使您超出对在 sed 命令行中的位置的期望。
它允许sed -i filename -e "expression" AnotherFileName
哪个是sed -i'NoExtensionGiven' "expression" filename AnotherFileName.
回答by Acidic9
For support on both OSX and Linux, I use a simple if check to see if the bash script is running on OSX or Linux, and adjust the command's -iargument based on that.
为了支持 OSX 和 Linux，我使用了一个简单的 if 检查来查看 bash 脚本是在 OSX 还是 Linux 上运行，并-i根据它调整命令的参数。
if [[ "$OSTYPE" == "darwin"* ]]; then
sed -i '' -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}"
else
sed -i -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}"
fi
