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Escape a string for a sed replace pattern
In my bash script I have an external (received from user) string, which I should use in sed pattern.
14 Answers
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Why does SIGPIPE exist?
... (and does) return -1 and set errno to EPIPE ... So why do we have the extra overhead of a signal? Every time I work with pipes I ignore SIGPIPE and have never felt any pain as a result, am I missing something?
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How can I force division to be floating point? Division keeps rounding down to 0?
...representing one). If you might be dealing with other types (such as complex numbers) you'll need to either check for those or use a different method.
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How can I check whether a radio button is selected with JavaScript?
I have two radio buttons within an HTML form. A dialog box appears when one of the fields is null. How can I check whether a radio button is selected?
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Read password from stdin
...th binaries in other language, in particular C, hence leveraging a lot of existing stuff (such as getpass(), I believe)
– mjv
Nov 19 '09 at 8:35
2
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Merge PDF files
...ython
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
def pdf_cat(input_files, output_stream):
input_streams = []
try:
# First open all the files, then produce the output file, and
# f...
How do I pick randomly from an array?
...ould require "backports/1.9.1/array/sample".
Note that in Ruby 1.8.7 it exists under the unfortunate name choice; it was renamed in later version so you shouldn't use that.
Although not useful in this case, sample accepts a number argument in case you want a number of distinct samples.
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How to Generate unique file names in C#
...n't matter, use GUIDs.
E.g.:
var myUniqueFileName = string.Format(@"{0}.txt", Guid.NewGuid());
or shorter:
var myUniqueFileName = $@"{Guid.NewGuid()}.txt";
In my programs, I sometimes try e.g. 10 times to generate a readable name ("Image1.png"…"Image10.png") and if that fails (because the f...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
Could someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning.
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str.startswith with a list of strings to test for
..."catalog", "script", "katalog")):
From the docs:
str.startswith(prefix[, start[, end]])
Return True if string starts with the prefix, otherwise return False. prefix can also be a tuple of prefixes to look for.
Below is a demonstration:
>>> "abcde".startswith(("xyz", "abc"))
T...