How to get the file length in C on Linux given the address of the file (e.g. “/tmp/a.txt”)?

This function returns the length of the file:

#include <sys/stat.h>

long file_length(char *f)
{
    struct stat st;
    stat(f, &st);
    return st.st_size;
}
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A related question: how to find the replication factors of files in a HDFS cluster? method 1: You can use the HDFS command line to ls the file. The second column of the output will show the replication factor of the file. For example, $ hdfs dfs -ls /usr/GroupStorage/data1/out.txt -rw-r–r– 3 hadoop zma 11906625598 2014-10-22…

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