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Langue: en

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Version: 371498 (fedora - 01/12/10)

Section: 1 (Commandes utilisateur)


zzcat - concatenate files using different instruction sequences


zzcat [-AbdeEntTv] [-r loops] [-x sequence] [FILE]...
zzcat -l | --list
zzcat -h | --help
zzcat -V | --version


The zzcat utility reads files sequentially, writing them to the standard output. The user can decide which sequence of library calls is used to seek and read data.

zzcat is primarily used as a debugging tool for zzuf, because it can emulate different programs' ways to read files.


-A, --show-all
Equivalent to -vET.
-b, --number-nonblank
Number nonempty output lines.
-d, --debug
Output debugging information.
Equivalent to -vET.
-E, --show-ends
Display $ at end of each line.
-n, --number
Number all output lines.
-r, --repeat=loops
Concatenate all files loops times.
Equivalent to -vT.
-T, --show-tabs
Display TAB characters as ^I.
-v, --show-nonprinting
Use ^ and M- notation, except for LFD and TAB.
-x, --execute=sequence
Read a file or a stream using the instruction sequence specified in sequence.

Instructions are executed sequentially until the end of the program. End-of-file is not an exit condition, except where the feof keyword is used:

fread(1,10); feof(1); fread(1,10)

Loops are permitted using the repeat keyword. Again, feof can be used to prematurely break out of a loop:

repeat(10000, fgetc() feof(1))

Instructions can be separated by spaces, commas or semicolons. A list of all available instructions and control keywords can be obtained using this command:

zzcat -l

If no sequence is specified, the following default sequence is used:

repeat(-1, fread(1,32768), feof(1))

-l, --list
Display the list of supported keywords and functions and exit.
-h, --help
Display a short help message and exit.
-V, --version
Output version information and exit.


Read the first 1000 bytes of f, then exit:

zzcat -x aqfread(1,1000)aq f

Read the first four bytes of f, using four different instructions:

zzcat -x aqgetc(),fgetc(),getc_unlocked(),_IO_getc()aq f

Read f entirely, by calling getc() repeatedly until end-of-file is reached:

zzcat -x aqrepeat(-1, getc(), feof(1))aq f

Read f entirely, in chunks of 32768 bytes until end-of-file is reached:

zzcat -x aqrepeat(-1, fread(1,32768), feof(1))aq f


zzuf(3), libzzuf(3)


Copyright © 2002-2010 Sam Hocevar <>.

zzcat and this manual page are free software. They come without any warranty, to the extent permitted by applicable law. You can redistribute them and/or modify them under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See for more details.

zzuf's webpage can be found at An overview of the architecture and inner works is at

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