Linux Shell 判断文件不存在

想编写一个脚本，执行我的程序，如果可执行文件不存在，则先编译在执行：
rm -rf runinfo/log
mkdir runinfo/log
rm -rf runinfo/index1208/*
echo dupserver strating......
if [![-s ../src/build/dupserver]]; then     #这个地方有问题：  run[5]: [![-s:  未找到
        cd ../src
        gm
        cd ../config
fi
../src/build/dupserver -i server.cfg

我想用那个if语句判断一下文件不存在的情况，但是失败了
请教大侠们怎么弄
还有，那个方括号什么意思？then前面的那个";"干什么用的，貌似“;"不要的话会出问题

9 个解决方案

#1

中括号[]前后要有空格

#2

if [![-s ../src/build/dupserver]];

[ -s ../src/build/dupserve ]

#3

现在我把每个 [ 和 ]前后都加了空格，出现了新问题
rm -rf runinfo/log
mkdir runinfo/log
rm -rf runinfo/index1208/*
echo dupserver strating......

if [ ! [ -e ../src/build/dupserver ] ] ; then     #run[6]: -e: test 命令参数无效。
        cd ../src
        gm
        cd ../config
fi
../src/build/dupserver -i server.cfg

再请教大侠们

#4

用 [ ! -e ../src/build/dupserver ]; 替换

#5

我了个擦，谁教你这样写的？

if [ ! -e "../src/build/dupserver" ] ; then

fi

这样就行了。

#6

a file exists.
-b file exists and is a block special file.
-c file exists and is a character special file.
-d file exists and is a directory.
-e file exists (just the same as -a).
-f file exists and is a regular file.
-g file exists and has its setgid(2) bit set.
-G file exists and has the same group ID as this process.
-k file exists and has its sticky bit set.
-L file exists and is a symbolic link.
-n string length is not zero.
-o Named option is set on.
-O file exists and is owned by the user ID of this process.
-p file exists and is a first in, first out (FIFO) special file or
named pipe.
-r file exists and is readable by the current process.
-s file exists and has a size greater than zero.
-S file exists and is a socket.
-t file descriptor number fildes is open and associated with a
terminal device.
-u file exists and has its setuid(2) bit set.
-w file exists and is writable by the current process.
-x file exists and is executable by the current process.
-z string length is zero.

-s 是可以的.

if [ -s ../src/build/dupserver ];then

#7

注意两边的空格就是了.

#8

OK了，多谢各位大侠们的帮助，感激不尽

现在脚本这样写的：
rm -rf runinfo/log
mkdir runinfo/log
rm -rf runinfo/index1208/*
echo dupserver strating......

if [ ! -e ../src/build/dupserver ] ; then
        cd ../src
        gmake
        cd ../config
fi
../src/build/dupserver -i server.cfg

#9

怎么少给了一个人分？晕，5楼那位大侠，大人大量，不要计较

#1