$ hg init

  $ echo 0 > a

  $ echo 0 > b

  $ hg ci -A -m m

  adding a

  adding b

  $ hg rm a

  $ hg cat a

  0

  $ hg cat --decode a # more tests in test-encode

  0

  $ echo 1 > b

  $ hg ci -m m

  $ echo 2 > b

  $ hg cat -r 0 a

  0

  $ hg cat -r 0 b

  0

  $ hg cat -r 1 a

  a: no such file in rev 7040230c159c

  [1]

  $ hg cat -r 1 b

  1

Test multiple files

  $ echo 3 > c

  $ hg ci -Am addmore c

  $ hg cat b c

  1

  3

  $ hg cat .

  1

  3

  $ hg cat . c

  1

  3

Test fileset

  $ hg cat 'set:not(b) or a'

  3

  $ hg cat 'set:c or b'

  1

  3

  $ mkdir tmp

  $ hg cat --output tmp/HH_%H c

  $ hg cat --output tmp/RR_%R c

  $ hg cat --output tmp/h_%h c

  $ hg cat --output tmp/r_%r c

  $ hg cat --output tmp/%s_s c

  $ hg cat --output tmp/%d%%_d c

  $ hg cat --output tmp/%p_p c

  $ hg log -r . --template "{rev}: {node|short}\n"

  2: 45116003780e

  $ find tmp -type f | sort

  tmp/.%_d

  tmp/HH_45116003780e3678b333fb2c99fa7d559c8457e9

  tmp/RR_2

  tmp/c_p

  tmp/c_s

  tmp/h_45116003780e

  tmp/r_2

Test working directory

  $ echo b-wdir > b

  $ hg cat -r 'wdir()' b

  b-wdir