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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...
Writing outputs to log file and console
...y want to write to a file and not the console try: echo "blah" | tee file1.txt | tee file2.txt >/dev/null 'Blah' will not be put in file1.txt & file2.txt, but not written to the console.
– danger89
Jan 6 '16 at 15:06
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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 ...
ContinuousSpeech 连续语音识别扩展：持续语音识别无需重复启动 · App Inventor 2 中文网
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Convert xlsx to csv in Linux with command line
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@hhh The separator option only works with txt export type. You can use this to print to stdout: ssconvert -O "separator=;" -T Gnumeric_stf:stf_assistant file.xlsx fd://1.
– exic
Sep 5 '17 at 10:52
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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 ...
Camera 扩展：相机拍照和录像，程序控制拍照、自动拍照实现，而无需点击系...
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Camera 扩展
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How to Remove ReadOnly Attribute on File Using PowerShell?
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You can use Set-ItemProperty:
Set-ItemProperty file.txt -name IsReadOnly -value $false
or shorter:
sp file.txt IsReadOnly $false
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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...
How to redirect and append both stdout and stderr to a file with Bash?
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cmd >>file.txt 2>&1
Bash executes the redirects from left to right as follows:
>>file.txt: Open file.txt in append mode and redirect stdout there.
2>&1: Redirect stderr to "where stdout is currently going". In th...