Difference between revisions of "Fseek"
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| l || ''/fseek -l <name> <linenumber>''. Moves the pointer to the begin of the specified line. | | l || ''/fseek -l <name> <linenumber>''. Moves the pointer to the begin of the specified line. | ||
|- | |- | ||
| − | | n || ''/fseek -n <name | + | | n || ''/fseek -n <name>''. Moves the pointer to the begin of the next line. |
|- | |- | ||
| − | | w || ''/fseek -w <name> <wildcard>''. Moves the pointer to the next | + | | w || ''/fseek -w <name> <wildcard>''. Moves the pointer to the next occurrence of a string matching this wildcard from the current position of the pointer (see example below). |
|- | |- | ||
| − | | r || ''/fseek -r <name> <regex>''. Moves the pointer to the next | + | | r || ''/fseek -r <name> <regex>''. Moves the pointer to the next occurrence of a string matching the regex. |
|} | |} | ||
| + | |||
| + | |||
| + | == Example == | ||
| + | Let's imagine with have the following file "moo.txt" in our mircdir: | ||
| + | This is my first line containing moo! | ||
| + | This is just a senseless text file. | ||
| + | mooooo | ||
| + | thats the end. | ||
| + | moo? | ||
| + | We have opened this file using ''[[Fopen|/fopen]] moo moo.txt'' | ||
| + | |||
| + | |||
| + | /fseek -l moo 2 | ||
| + | This example would set the position of the pointer to the begin of the second line (infront of ''This is just a senseless text file.''). | ||
| + | |||
| + | |||
| + | /fseek -n moo | ||
| + | This example would set the pointer to the begin of the next line (infront of 'mooooo'). | ||
| + | |||
| + | |||
| + | /fseek -w moo moo* | ||
| + | This example would move the pointer to the next occurrence of the word moo* after line three (that is line 5, ''moo?'' in our example file). | ||
| + | |||
| + | |||
| + | /fseek -w moo moo* | ||
| + | Now, this command would fail, as there is no other string containing ''moo'' after line 5. | ||
| + | |||
| + | |||
| + | [[Category:File Handling]][[Category:Commands]] | ||
Revision as of 00:17, 19 December 2005
Sets the read/write pointer to the specified position in the file.
/fseek <name> <position>
The following switches can also be used to move the file pointer:
| Switch | Meaning |
| l | /fseek -l <name> <linenumber>. Moves the pointer to the begin of the specified line. |
| n | /fseek -n <name>. Moves the pointer to the begin of the next line. |
| w | /fseek -w <name> <wildcard>. Moves the pointer to the next occurrence of a string matching this wildcard from the current position of the pointer (see example below). |
| r | /fseek -r <name> <regex>. Moves the pointer to the next occurrence of a string matching the regex. |
Example
Let's imagine with have the following file "moo.txt" in our mircdir:
This is my first line containing moo! This is just a senseless text file. mooooo thats the end. moo?
We have opened this file using /fopen moo moo.txt
/fseek -l moo 2
This example would set the position of the pointer to the begin of the second line (infront of This is just a senseless text file.).
/fseek -n moo
This example would set the pointer to the begin of the next line (infront of 'mooooo').
/fseek -w moo moo*
This example would move the pointer to the next occurrence of the word moo* after line three (that is line 5, moo? in our example file).
/fseek -w moo moo*
Now, this command would fail, as there is no other string containing moo after line 5.
