如何解决通过os.system推送
| 我正在使用crontab为我的Minecraft服务器运行维护脚本。在大多数情况下，它工作正常，除非crontab尝试使用重新启动脚本。如果我手动运行重新启动脚本，则不会有任何问题。因为我相信它与路径名有关，所以我试图确保它始终在minecraft目录中执行任何minecraft命令。所以我将命令包含在push / popd中：os.system(\"pushd /directory/path/here\")
os.system(\"command to sent to minecraft\")
os.system(\"popd\")
>>> 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
解决方法
每个shell命令在单独的进程中运行。它产生一个shell，执行pushd命令，然后shell退出。
只需在相同的shell脚本中编写命令：
os.system(\"cd /directory/path/here; run the commands\")
subprocess
from subprocess import Popen
Popen(\"run the commands\",shell=True,cwd=\"/directory/path/here\")
import contextlib
import os
@contextlib.contextmanager
def pushd(new_dir):
previous_dir = os.getcwd()
os.chdir(new_dir)
yield
os.chdir(previous_dir)
with pushd(\'somewhere\'):
print os.getcwd() # \"somewhere\"
print os.getcwd() # \"wherever you started\"
with pushd(\'somewhere\'):
# do something
with pushd(\'another/place\'):
# do something else
# do something back in \"somewhere\"
os.system()
pushd
>>> import os
>>> ret = os.system(\"pushd /tmp\")
sh: pushd: not found
pushd
system()
pushd
ls
popd
pushd
popd
pushd
popd
# initialise a directory stack
pushstack = list()
def pushdir(dirname):
global pushstack
pushstack.append(os.getcwd())
os.chdir(dirname)
def popdir():
global pushstack
os.chdir(pushstack.pop())
pushd
os.chdir
>>> import os
>>> os.getcwd()
\'/Users/me\'
>>> os.chdir(\'..\')
>>> os.getcwd()
\'/Users\'
>>> os.chdir(\'me\')
>>> os.getcwd()
\'/Users/me\'
import os
class pushd: # pylint: disable=invalid-name
__slots__ = (\'_pushstack\',)
def __init__(self,dirname):
self._pushstack = list()
self.pushd(dirname)
def __enter__(self):
return self
def __exit__(self,exec_type,exec_val,exc_tb) -> bool:
# skip all the intermediate directories,just go back to the original one.
if self._pushstack:
os.chdir(self._pushstack.pop(0)))
if exec_type:
return False
return True
def popd(self) -> None:
if len(self._pushstack):
os.chdir(self._pushstack.pop())
def pushd(self,dirname) -> None:
self._pushstack.append(os.getcwd())
os.chdir(dirname)
with pushd(dirname) as d:
... do stuff in that dirname
d.pushd(\"../..\")
d.popd()
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