echo $name set name = "Mark Meyer" # if the string has space, must use "" echo $name # it means set to NULL set name = unset name # get user input set x = $< set current_user = `whoami` #buildin vars echo $user
if ($#_pa_args > 1) then set _pa_varname = $_pa_args[1] set _pa_new_path = $_pa_args[2] endif # Check whether the variable is set yet. # Check whether the variable is set yet. set _pa_old_value = "" set _pa_old_value = "" ...
echo $user # who am I? echo $status # a numeric variable, usually used to retun error codes #Arithmetic variables @ i = 2 @ k = ($x - 2) * 4 @ k = $k + 1 @ i-- @ i++ #array set name = (mark sally kathy tony) echo $#name # num of the array echo $name[1] e...
If noclobber is set, it is an error for the file not to exist, unless one of the ! forms is used. The & forms append both the standard error and standard output to the file.Variable SubstitutionThe C shell maintains a set of variables, each of which is composed of a name and a ...
remote system uses theexeccommand on a command sent by the local system, both the command and the shell are carried out. For example,exec csh rcp -tFilenameexecutes the.cshrcfile and treats the echoed output as the expected response. Anifclause can be used to check for the$promptvariable....
Except as noted below, it is an error to refer to a variable that is not set. $var ${var} These are replaced by words from the value of var, each separated by a space character. If var is an environment variable, its value is returned (but `:' modifiers and the other forms ...
set name ="Mark Meyer"# if the string has space, must use"" echo $name # it means set to NULL set name = unset name # get user input set x = $< set current_user = `whoami` #buildin vars echo $user # who am I? echo $status # a numeric variable, usually used to retun er...
"Mark Meyer" # if the string has space, must use ""echo $name# it means set to NULLset name = unset name# get user inputset x = $< set current_user = `whoami`#buildin varsecho $user # who am I?echo $status # a numeric variable, usually used to retun error codes#Arithmetic ...
bash来⾃于BSD Unix，语法⾮常类似于C语⾔，所以通常有C/C++编程背景的开发⼈员最喜欢使⽤。ksh是对sh的扩展，且吸收了csh的⼀些有⽤的功能，但是由于开始ksh的license是AT&T，所以后来出现了很多的ksh的开源版本，例如mksh，pdksh等。bash是现在很多Linux的发⾏版中默认的shell，综合了其他shell的很多...
代码片段如下： class Edge { public PointF start; public PointF end; ...