cmd删除非空文件夹rd+空格+/s/q+空格+d:\filedir for语句的基本用法在批处理文件中:FOR %%variable IN (command1) DO command2 [command-parameters]之所以要区分cmd窗口和批处理文件两种环境,是因为在这两种环境下,命令语句表现出来的行为虽然基本一样,但是在细节上还是稍有不同。最明显的一个差异就是:在cmd...
if [ -z "$DISTDIR" ] then # set DISTDIR to /usr/src/distfiles if not already set DISTDIR=/usr/src/distfiles fi export DISTDIR if [ -d ${WORKDIR} ] then # remove old work directory if it exists rm -rf ${WORKDIR} fi mkdir ${WORKDIR} cd ${WORKDIR} tar xzf ${DISTDIR}/${...
Examine a new file. If the filename is missing, the "current" file (see the :n and :p commands below) from the list of files in the command line is re-examined. A percent sign (%) in the filename is replaced by the name of the current file. A pound sign (#) is replaced by...
其中,pattern1、pattern2、pattern3是要匹配和删除的模式,file.txt是要操作的文件名。该命令会直接修改文件内容,删除匹配到的行。 使用grep命令结合管道操作符|和grep -v选项删除多个匹配: 使用grep命令结合管道操作符|和grep -v选项删除多个匹配: 其中,pattern1、pattern2、pattern3是要匹配和删除的模式,file.txt...
Size is > 0 bytes [[ -f FILE ]] # File [[ -x FILE ]] # Executable [[ FILE1 -nt FILE2 ]] # 1 is more recent than 2 [[ FILE1 -ot FILE2 ]] # 2 is more recent than 1 [[ FILE1 -ef FILE2 ]] # Same files if [[ -e "file.txt" ]]; then echo "file exists" fi...
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Inspect your script file for hidden control characters (such as \r) that can result in unexpected behavior; run cat -v scriptFile | fgrep ^ - it should produce NO output; if the file does contain \r chars., they would show as ^M. To remove the \r instances (more accurately, to co...
$ bash bash mkdir: cannot create directory '/var/tmp': File exists mount: can't find /tmp in /etc/fstab mount: can't find /var/tmp in /etc/fstab bash: line 13: ufw: command not found iptables v1.4.21: can't initialize iptables table `filter': Permission denied (you must be roo...
# remove old work directory if it exists rm -rf work fi mkdir work cd work tar xzf /usr/src/distfiles/sed-3.02.tar.gz cd sed-3.02 ./configure --prefix=/usr make 回页首 使代码通用 虽然可以使用这个自动编译脚本,但它不是很灵活。基本上,bash 脚本只包含在命令行输入的所有命令列表。虽然可以...
cat - > /tmp/xxx,或者echo "$(</dev/stdin)" > /tmp/xxx将标准输入(屏幕输入)直接输出到xxx文件中。使用ctrl+d中止输入。How to redirect stdin to file in bash。 条件判断 Introduction toif; [ "$a" \> "$b"]字符串比较大小;>和<是重定向字符,做大小比较时,要转义。文件是否存在等。