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Shell command to sum integers, one per line?
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Plain bash:
$ cat numbers.txt
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$ sum=0; while read num; do ((sum += num)); done < numbers.txt; echo $sum
55
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improve ...
Get a filtered list of files in a directory
..._82_0', 'data/ks_lecture_dp_1', 'data/ks_lecture_dp_2']
Fiter extension .txt:
files = glob.glob("/home/ach/*/*.txt")
A single character
glob.glob("/home/ach/file?.txt")
Number Ranges
glob.glob("/home/ach/*[0-9]*")
Alphabet Ranges
glob.glob("/home/ach/[a-c]*")
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How to create a file with a given size in Linux?
...h>
#include <stdlib.h>
int main() {
int fd = creat("/tmp/foo.txt", 0644);
ftruncate(fd, SIZE_IN_BYTES);
close(fd);
return 0;
}
This approach is especially useful to subsequently mmap the file into memory.
use the following command to check that the file has the correct s...
How can I read a large text file line by line using Java?
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// Open the file
FileInputStream fstream = new FileInputStream("textfile.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
// Print the content on the console
System.out.printl...
is there any way to force copy? copy without overwrite prompt, using windows?
...and C:\WC_Data_Transfer\Portugal>move /Y W:\Portugal\ENCAISSEMENTP.txt W:\Portugal\yesterday\ENCAISSEMENTP.txt Overwrite W:\Portugal\yesterday\ENCAISSEMENTP.txt? (Yes/No/All): on Windows Server 2003 standard edition. "W" is a network drive and mentioned file has permissions for that use...
Tools to search for strings inside files without indexing [closed]
...ic characters in file names. For example: FINDSTR: Cannot open ???????????.txt
– Artem Russakovskii
Feb 16 '19 at 19:36
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Specify sudo password for Ansible
...which it will use to decrypt your secret file.
Create a file called vault.txt and in that put the password that you used when creating your secret file. The password should be a string stored as a single line in the file.
From the Ansible Docs:
.. ensure permissions on the file are such that n...
How to make a valid Windows filename from an arbitrary string?
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@AndyM No need to. file.name.txt.pdf is a valid pdf. Windows reads only the last . for the extension.
– Diego Jancic
May 25 '16 at 13:32
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How to go to each directory and execute a command?
...care in which directory you execute them. for f in foo bar; do cat "$f"/*.txt; done >output is functionally equivalent to cat foo/*.txt bar/*.txt >output. However, ls is one command that does produce slightly different output depending on how you pass it arguments; similarly, a grep or wc wh...
How can I echo a newline in a batch file?
... @Shahbaz - $ (echo Hello && echo World) > ./File.txt
– Nathan J.B.
Nov 30 '11 at 5:28
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