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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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由于评论里有过长的URL,所以本页排版比较混乱,推荐你到原处查看,看完了如果有问题,再到这里来提出.
一些要说的话：
如果你没有正则表达式的基础，请跟着教程“一步步来”。请不要大概地扫两眼就说看不懂——...
How to view file diff in git before commit
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If you want to see what you haven't git added yet:
git diff myfile.txt
or if you want to see already added changes
git diff --cached myfile.txt
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improve this answer
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How can I check file size in Python?
... 3.4+):
>>> from pathlib import Path
>>> Path('somefile.txt').stat()
os.stat_result(st_mode=33188, st_ino=6419862, st_dev=16777220, st_nlink=1, st_uid=501, st_gid=20, st_size=1564, st_atime=1584299303, st_mtime=1584299400, st_ctime=1584299400)
>>> Path('somefile.txt').sta...
Sort a text file by line length including spaces
...lt;1 second, when output redirected into another file - thus: cat testfile.txt | perl -e 'print sort { length($a) <=> length($b) } <>' > out.txt
– cssyphus
May 12 at 18:44
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libevent+protobuf轻松搭建tcpserver - C/C++ - 清泛网 - 专注C/C++及内核技术
...}
if (client->cur_size >= client->total_len) {
// 处理该(完整的)请求
request_t req; // 请求的数据结构(通过protobuf定义)
response_t res; // 回应的数据结构(通过protobuf定义)
// 调用处理函数对request进行处理,并把...
grep exclude multiple strings
... examples of filtering out multiple lines with grep:
Put this in filename.txt:
abc
def
ghi
jkl
grep command using -E option with a pipe between tokens in a string:
grep -Ev 'def|jkl' filename.txt
prints:
abc
ghi
Command using -v option with pipe between tokens surrounded by parens:
egrep ...
How to append text to an existing file in Java?
... the Files class makes this easy:
try {
Files.write(Paths.get("myfile.txt"), "the text".getBytes(), StandardOpenOption.APPEND);
}catch (IOException e) {
//exception handling left as an exercise for the reader
}
Careful: The above approach will throw a NoSuchFileException if the file does ...
Copying files from host to Docker container
...s.
One specific file can be copied TO the container like:
docker cp foo.txt mycontainer:/foo.txt
One specific file can be copied FROM the container like:
docker cp mycontainer:/foo.txt foo.txt
For emphasis, mycontainer is a container ID, not an image ID.
Multiple files contained by the fold...
Bash tool to get nth line from a file
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sed -n '2p' < file.txt
will print 2nd line
sed -n '2011p' < file.txt
2011th line
sed -n '10,33p' < file.txt
line 10 up to line 33
sed -n '1p;3p' < file.txt
1st and 3th line
and so on...
For adding lines with sed, you can c...
Split string with delimiters in C
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Here is my two cents:
int split (const char *txt, char delim, char ***tokens)
{
int *tklen, *t, count = 1;
char **arr, *p = (char *) txt;
while (*p != '\0') if (*p++ == delim) count += 1;
t = tklen = calloc (count, sizeof (int));
for (p = (char *) t...