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How to use sed to replace only the first occurrence in a file?
... then only looked for starting on the next line. Therefore, both lines are selected in this case, and the s/foo/bar/ substitution is performed on both of them.
sed '1,/foo/ s//bar/' <<<$'1foo\n2foo\n3foo' fails: with sed: first RE may not be empty (BSD/macOS) and sed: -e expression #1, char...
What is the iPad user agent?
...is using iPhone OS, but with a different screen resolution from the iPhone and iPod touch. So many sites may have to change their user agent detection to adapt to the iPad.
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How to get file creation & modification date/times in Python?
...on date in a cross-platform way is easy - just call os.path.getmtime(path) and you'll get the Unix timestamp of when the file at path was last modified.
Getting file creation dates, on the other hand, is fiddly and platform-dependent, differing even between the three big OSes:
On Windows, a file'...
How to import an excel file in to a MySQL database
...r Excel table into the sales table of a MySQL database named mydatabase.
Select the relevant cells:
Paste into Mr. Data Converter and select the output as MySQL:
Change the table name and column definitions to fit your requirements in the generated output:
CREATE TABLE sales (
id INT NOT N...
Detecting Windows or Linux? [duplicate]
I am seeking to run a common Java program in both Windows and Linux.
5 Answers
5
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How to move a file?
...)
Note that you must include the file name (file.foo) in both the source and destination arguments. If it is changed, the file will be renamed as well as moved.
Note also that in the first two cases the directory in which the new file is being created must already exist. On Windows, a file with t...
How do I print a list of “Build Settings” in Xcode project?
...Build Settings” when it's built:
To add, (with the target in question selected) under the Build Phases tab-section click the little ➕ button a dozen-or-so pixels up-left-ward from the Target Dependencies section, and set the shell to /bin/bash and the command to export. You'll also probabl...
MySQL OPTIMIZE all tables?
...>.<your_table>;, optimize all tables in a given schema like this: select concat('OPTIMIZE NO_WRITE_TO_BINLOG TABLE ',table_schema,'.',table_name,';') into outfile '/tmp/optimize_all_tables.sql' from information_schema.tables where table_schema = 'pabeta' and table_type = 'base table'; sourc...
How should I print types like off_t and size_t?
...o I suggest you should first check the length size_t on your platform then select one of them:
if sizeof(size_t) == 4 use PRIu32
if sizeof(size_t) == 8 use PRIu64
And I suggest using stdint types instead of raw data types for consistancy.
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Python recursive folder read
I have a C++/Obj-C background and I am just discovering Python (been writing it for about an hour).
I am writing a script to recursively read the contents of text files in a folder structure.
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