csh的一些显著特点包括: 内置语法:与C语言相似的控制流语句,如if-else和switch-case结构。 内置表达式:支持数学表达式的内置求值。 别名功能:允许为命令序列定义简短的名称。 历史特性:能够查看和重复执行先前的命令。 尽管csh在某些方面非常强大,但它也因编程语法的一些怪癖和限制而受到批评。 Bourne-Again Shell(bash...
一、实践证明，在AIX上用的是ksh，linux上是bash sh或bsh，全名是bourne shell。它最早出现，是标准she...
The case statement is similar to the switch statement of the C programming language or the case statement of Pascal. If the given word matches any one of the patterns separated by or-bar (|) characters, sh executes the corresponding compound-command. The patterns follow the rules given in Fi...
switch(1) sxpm(1) symcryptrun(1) symilar(1) symorder(1) sync(1g) synclient(1) syndaemon(1) sys-suspend(1) sysV-make(1) t300(1) t300s(1) t4014(1) t450(1) tab2space(1) tabs(1) tac(1) tail(1) tail(1g) talk(1) tar(1) tar(1g) tbl(1) tclsh(1) tcopy(1) tcpdump...
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So, in your case, the PATH is probably set differently; and consequently the ls executable cannot be found. The pwd is probably a built-in command of your shell, so it does not need any path. To verify that this is the root cause, disable the pseudo terminal allocation in...
Power Switch - It worked out great just to expose the switch built into the power supply at the edge of the case. Keyboard and Input This build uses a few input methods: Mechanical keyboard with chording and mouse emulation. Rotary encoder to emulate a mouse wheel (at least) Accelerometir...
Commands can be followed by one or more words which are the arguments to the command. How a shell tokenizes the input into words is complicated in the general case, but in the common case the arguments are whitespace delimited. simple command with redirect ...
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