BakingΒΆ

sh is capable of “baking” arguments into commands. This is essentially partial application, like you might do with functools.partial().

from sh import ls

ls = ls.bake("-la")
print(ls) # "/usr/bin/ls -la"

# resolves to "ls -la /"
print(ls("/"))

The idea here is that now every call to ls will have the “-la” arguments already specified. Baking can become very useful when you combine it with Sub-commands:

from sh import ssh

# calling whoami on a server.  this is a lot to type out, especially if
# you wanted to call many commands (not just whoami) back to back on
# the same server
iam1 = ssh("myserver.com", "-p 1393", "whoami")

# wouldn't it be nice to bake the common parameters into the ssh command?
myserver = ssh.bake("myserver.com", p=1393)

print(myserver) # "/usr/bin/ssh myserver.com -p 1393"

# resolves to "/usr/bin/ssh myserver.com -p 1393 whoami"
iam2 = myserver.whoami()

assert(iam1 == iam2) # True!

Now that the “myserver” callable represents a baked ssh command, you can call anything on the server easily:

# executes "/usr/bin/ssh myserver.com -p 1393 tail /var/log/dumb_daemon.log -n 100"
print(myserver.tail("/var/log/dumb_daemon.log", n=100))