"the expression after the if is an arithmetic or logical expression evaluated internally by tcsh, while with bash the conditional expression is a command," ... "With tcsh, however, if you wish to run external commands within the expression, you must enclose the command in braces: {command}."
"the expression after the if is an arithmetic or logical expression evaluated internally by tcsh, while with bash the conditional expression is a command," ... "With tcsh, however, if you wish to run external commands within the expression, you must enclose the command in braces: {command}."
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Shell Programming (Running Linux)
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