通过 os.system 推送

pushd through os.system(通过 os.system 推送)

问题描述

我正在使用 crontab 为我的 minecraft 服务器运行维护脚本.大多数时候它工作正常，除非 crontab 尝试使用重启脚本.如果我手动运行重新启动脚本，则没有任何问题.因为我相信它与路径名有关，所以我试图确保它总是从 minecraft 目录执行任何 minecraft 命令.所以我将命令封装在 pushd/popd 中:

I'm using a crontab to run a maintenance script for my minecraft server. Most of the time it works fine, unless the crontab tries to use the restart script. If I run the restart script manually, there aren't any issues. Because I believe it's got to do with path names, I'm trying to make sure it's always doing any minecraft command FROM the minecraft directory. So I'm encasing the command in pushd/popd:

os.system("pushd /directory/path/here")
os.system("command to sent to minecraft")
os.system("popd")

下面是一个交互式会话，将我的世界从等式中剔除.一个简单的ls"测试.如您所见，它根本没有从 pushd 目录运行 os.system 命令，而是从/etc/运行 python 来说明我的观点的目录.显然 pushd 不能通过 python 工作，所以我想知道我还能如何实现这一目标.谢谢！

Below is an interactive session taking minecraft out of the equation. A simple "ls" test. As you can see, it does not at all run the os.system command from the pushd directory, but instead from /etc/ which is the directory in which I was running python to illustrate my point.Clearly pushd isn't working via python, so I'm wondering how else I can achieve this. Thanks!

>>> def test():
...     import os
...     os.system("pushd /home/[path_goes_here]/minecraft")
...     os.system("ls")
...     os.system("popd")
... 
>>> test()
~/minecraft /etc
DIR_COLORS    cron.weekly  gcrypt         inputrc    localtime   mime.types         ntp       ppp         rc3.d       sasldb2         smrsh      vsftpd.ftpusers
DIR_COLORS.xterm  crontab      gpm-root.conf      iproute2   login.defs  mke2fs.conf            ntp.conf      printcap        rc4.d       screenrc        snmp       vsftpd.tpsave
X11       csh.cshrc    group          issue      logrotate.conf  modprobe.d         odbc.ini      profile         rc5.d       scsi_id.config  squirrelmail   vz
adjtime       csh.login    group-         issue.net  logrotate.d     motd               odbcinst.ini  profile.d       rc6.d       securetty       ssh        warnquota.conf
aliases       cyrus.conf   host.conf      java       lvm         mtab               openldap      protocols       redhat-release  security        stunnel        webalizer.conf
alsa          dbus-1       hosts          jvm        lynx-site.cfg   multipath.conf         opt       quotagrpadmins  resolv.conf     selinux         sudoers        wgetrc
alternatives      default      hosts.allow    jvm-commmon    lynx.cfg    my.cnf             pam.d         quotatab        rndc.key        sensors.conf    sysconfig      xinetd.conf
bashrc        depmod.d     hosts.deny     jwhois.conf    mail        named.caching-nameserver.conf  passwd        rc          rpc         services        sysctl.conf    xinetd.d
blkid         dev.d        httpd          krb5.conf  mail.rc     named.conf         passwd-       rc.d        rpm         sestatus.conf   termcap        yum
cron.d        environment  imapd.conf     ld.so.cache    mailcap     named.rfc1912.zones        pear.conf     rc.local        rsyslog.conf    setuptool.d     udev       yum.conf
cron.daily    exports      imapd.conf.tpsave  ld.so.conf     mailman     netplug            php.d         rc.sysinit      rwtab       shadow          updatedb.conf  yum.repos.d
cron.deny     filesystems  init.d         ld.so.conf.d   makedev.d   netplug.d          php.ini       rc0.d       rwtab.d         shadow-         vimrc
cron.hourly   fonts        initlog.conf   libaudit.conf  man.config  nscd.conf          pki       rc1.d       samba       shells          virc
cron.monthly      fstab        inittab        libuser.conf   maven       nsswitch.conf          postfix       rc2.d       sasl2       skel        vsftpd
sh: line 0: popd: directory stack empty

===(CentOS 服务器与 python 2.4)

=== (CentOS server with python 2.4)

推荐答案

每个 shell 命令都在单独的进程中运行.它生成一个 shell，执行 pushd 命令，然后 shell 退出.

Each shell command runs in a separate process. It spawns a shell, executes the pushd command, and then the shell exits.

只需在同一个 shell 脚本中编写命令:

Just write the commands in the same shell script:

os.system("cd /directory/path/here; run the commands")

更好的(也许)方法是使用 subprocess 模块:

A nicer (perhaps) way is with the subprocess module:

from subprocess import Popen
Popen("run the commands", shell=True, cwd="/directory/path/here")

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