[英]replace newline character in bash variable?
I am trying to understand the "cdargs-bash.sh" script with cdargs packages. 我试图用cdargs包理解“cdargs-bash.sh”脚本。 And I have a question about in the following function:
我在以下函数中有一个问题:
function _cdargs_get_dir ()
{
local bookmark extrapath
# if there is one exact match (possibly with extra path info after it),
# then just use that match without calling cdargs
if [ -e "$HOME/.cdargs" ]; then
dir=`/bin/grep "^$1 " "$HOME/.cdargs"`
if [ -z "$dir" ]; then
bookmark="${1/\/*/}"
if [ "$bookmark" != "$1" ]; then
dir=`/bin/grep "^$bookmark " "$HOME/.cdargs"`
extrapath=`echo "$1" | /bin/sed 's#^[^/]*/#/#'`
fi
fi
[ -n "$dir" ] && dir=`echo "$dir" | /bin/sed 's/^[^ ]* //'`
fi
if [ -z "$dir" -o "$dir" != "${dir/
/}" ]; then
# okay, we need cdargs to resolve this one.
# note: intentionally retain any extra path to add back to selection.
dir=
if cdargs --noresolve "${1/\/*/}"; then
dir=`cat "$HOME/.cdargsresult"`
/bin/rm -f "$HOME/.cdargsresult";
fi
fi
if [ -z "$dir" ]; then
echo "Aborted: no directory selected" >&2
return 1
fi
[ -n "$extrapath" ] && dir="$dir$extrapath"
if [ ! -d "$dir" ]; then
echo "Failed: no such directory '$dir'" >&2
return 2
fi
} }
What's the purpose of the testing: 测试的目的是什么:
"$dir" != "${dir/
/}"
Here the testing span over two lines; 这里测试跨越两条线; does it want to remove the newline character in
$dir
or maybe for some other reason? 它是否要删除
$dir
中的换行符或者出于其他原因? I am just starting to learn bash scripting and I have Googled some time but couldn't find any usage like this. 我刚刚开始学习bash脚本,我用Google搜索了一段时间但找不到这样的用法。
Yes you are right, it removes the newline character. 是的,你是对的,它删除了换行符。 I think the purpose of the test is to make sure
$dir
doesn't contain multiple lines. 我认为测试的目的是确保
$dir
不包含多行。
Alternatively, you can remove \\newline
by 或者,您可以删除
\\newline
by
${dir/$'\n'/}
This doesn't require two lines so I think it looks better. 这不需要两行,所以我觉得它看起来更好。
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