我有file1.txt,它有以下内容
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
|| ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
|| uses_abstraction "${GRUB_DEVICE}" lvm; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi
GRUBFS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`"
Linux_CMDLINE="nowatchdog rcupdate.rcu_cpu_stall_suppress=1"
我想找到以Linux\u CMDLINE=“开始的字符串,并用Linux\u CMDLINE=”替换该行
我尝试了下面的代码,它不工作。我也认为这不是最好的执行方式。有什么简单的方法可以做到这一点吗?你知道吗
with open ('/etc/grub.d/42_sgi', 'r') as f:
newlines = []
for line in f.readlines():
if line.startswith('Linux_CMDLINE=\"'):
newlines.append("Linux_CMDLINE=\"\"")
else:
newlines.append(line)
with open ('/etc/grub.d/42_sgi', 'w') as f:
for line in newlines:
f.write(line)
预期输出:
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
|| ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
|| uses_abstraction "${GRUB_DEVICE}" lvm; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi
GRUBFS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`"
Linux_CMDLINE=""
由于open file for both reading and writing?,代码最少
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