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/etc/default/tmpfs is in initscripts 2.88dsf-41+deb7u1.

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The actual contents of the file can be viewed below.

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# Configuration for tmpfs filesystems mounted in early boot, before
# filesystems from /etc/fstab are mounted.  For information about
# these variables see the tmpfs(5) manual page.

# /run is always mounted as a tmpfs on systems which support tmpfs
# mounts.

# mount /run/lock as a tmpfs (separately from /run).  Defaults to yes;
# set to no to disable (/run/lock will then be part of the /run tmpfs,
# if available).
#RAMLOCK=yes

# mount /run/shm as a tmpfs (separately from /run).  Defaults to yes;
# set to no to disable (/run/shm will then be part of the /run tmpfs,
# if available).
#RAMSHM=yes

# mount /tmp as a tmpfs.  Defaults to no; set to yes to enable (/tmp
# will be part of the root filesystem if disabled).  /tmp may also be
# configured to be a separate mount in /etc/fstab.
#RAMTMP=no

# Size limits.  Please see tmpfs(5) for details on how to configure
# tmpfs size limits.
#TMPFS_SIZE=20%VM
#RUN_SIZE=10%
#LOCK_SIZE=5242880 # 5MiB
#SHM_SIZE=
#TMP_SIZE=

# Mount tmpfs on /tmp if there is less than the limit size (in kiB) on
# the root filesystem (overriding RAMTMP).
#TMP_OVERFLOW_LIMIT=1024