I found that the busybox's ash syntax is different from the other standard shells (sh, bash, tcsh).
Is there any documentation of its syntax or a tutorial for ash ?
Ash is a simple unix shell, as compared to bash , which is the more typical fully featured shell preferred on Linux systems. Busybox is a program that implements an ash like shell, as well as a number of other common unix programs, though in a stripped down version, all in a single program.
BusyBox uses the Almquist shell, also known as A Shell, ash and sh. An alternative for customization is the smaller 'hush' shell.
Almquist shell (also known as A Shell, ash and sh) is a lightweight Unix shell originally written by Kenneth Almquist in the late 1980s. Initially a clone of the System V. 4 variant of the Bourne shell, it replaced the original Bourne shell in the BSD versions of Unix released in the early 1990s.
http://www.in-ulm.de/~mascheck/various/ash/#busybox from the link seems busybox ash is debian dash.
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