CentOS下如何避免文件覆盖?
<p># touch he.txt</p><p># set -o noclobber</p>
<p># echo "123" > he.txt</p>
<p>bash: he.txt: cannot overwrite existing file</p>
<p><strong>如果要取消限制，就把set -o 改为set +o</strong></p>
<p># set +o noclobber</p>
<p># echo "123" > he.txt</p>
<p># cat he.txt</p>
<p>123</p>
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