You can also use a negative step to step through a range in decreasing values. For example, 1,1,5 generates the sequence 1 2 3 4 5 and 5,-1,1 generates the sequence 5 4 3 2 1.
Iterating and file parsing: Use file parsing to process command output, strings, and file content. Use iterative variables to define the content or strings that you want to examine, and use the various parsingkeywords options to further modify the parsing.
Use the parsingkeywords token option to specify which tokens should be passed as iterative variables. File parsing consists of reading the output, string, or file content, and then breaking it into individual lines of text and parsing each line into zero or more tokens. The for loop is then called with the iterative variable value set to the token. Blank lines are skipped. The set argument specifies one or more file names. Each file is opened, read, and processed before moving to the next file in set.
To override the default parsing behavior, specify parsingkeywords. This is a quoted string that contains one or more keywords to specify different parsing options. Variable substitution: The following table lists optional syntax for any variable I :.
It is treated as a command line, which is passed to a child Cmd. The output is captured into memory and parsed as if it is a file. To display the contents of all the files in the current directory that have the extension. In the preceding example, each file that has the. Otherwise, the variable is ignored and an error message is displayed.
DO varname IN file [ command ]. Integer in the range [0, ], or an internal variable or variable function that evaluates to such a value, specifying the number of times the loop is executed. The environment variable containing the current value of the loop index, or the current filename or string, or the current line from a file.
Integers in the range [- , ] or internal variables or variable functions that evaluate to such values, controlling the number of times the loop is executed. A conditional expression to determine whether or not the loop should be executed. A filename or list of filenames, possibly using wildcards.
An arbitrary set of strings. Wildcards are not interpreted. A file each line of which contains a string the loop is to be executed for.
A date, time, size or exclusion range. At most one of each, in any order. One or more commands to execute each time through the loop. If you use multiple commands, they must be separated by command separators or be placed on separate lines. The loop termination time in h hh:mm:ss format. Members of set are strings, not filenames. Parse the output of the command, saving the next output line in varname each time the loop is executed.
Perform the loop in the current directory and all its subdirectories. Supports extended wildcards , ranges , and include lists for the set. DO can be used in batch files , aliases, or at the command prompt.
To use them in aliases or at the prompt, you need to define the DO on a single line, and enclose the body of the DO loop in a command group following the DO expression. For example:. If the last argument on the line is a single , it is interpreted as the beginning of a command group. DO will append the following lines in a batch file or prompt you for more input at the command line until it gets a closing.
When you use DO on an LFN drive, you must quote any file names which contain white space or special characters. The same restriction may apply to names returned in the DO variable, if you pass them to TCC internal commands, or other commands which require quoting filenames with white space. DO does not quote returned names automatically, even if you included quotes in the original argument. DO can be used to create several different kinds of loops. For this reason it is recommended to always place delims as the last option before the closing quotation, it is much easier to see what is happening with one space or no spaces at the end of the string.
A string of text will be treated just like a single line of input from a file, the string must be enclosed in double quotes or single quotes with usebackq. Echo just the date from the following string. To specify an exact set of files to be processed, such as all. Many of the newer commands and utilities e. To convert the file format use the TYPE command. FOR does not, by itself, set or clear an Errorlevel , leaving that to the command being called.
0コメント