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How to find the size of a file?
Input : file_name = “a.txt” Let “a.txt” contains “geeks” Output : 6 Bytes There are 5 bytes for 5 characters then an extra byte for end of file. Input : file_name = “a.txt” Let “a.txt” contains “geeks for geeks” Output : 16 Bytes Recommended: Please try your approach on {IDE} first, before moving on to the solution.
How to set the file position of a descriptor?
13.3 Setting the File Position of a Descriptor Just as you can set the file position of a stream with fseek, you can set the file position of a descriptor with lseek. This specifies the position in the file for the next reador writeoperation. See File Positioning, for more information on the file position and what it means.
What is the file position primitive in the C library?
File Position Primitive (The GNU C Library) File Position Primitive (The GNU C Library) Next: Descriptors and Streams, Previous: I/O Primitives, Up: Low-Level I/O [Contents][Index] 13.3 Setting the File Position of a Descriptor Just as you can set the file position of a stream with fseek, you can set the file position of a descriptor with lseek.
Can you change the position of a file in lseek?
You can set the file position past the current end of the file. This does not by itself make the file longer; lseek never changes the file. But subsequent output at that position will extend the file. Characters between the previous end of file and the new position are filled with zeros.
If you want to say “size is non-zero”, you need [ -s file.txt ]. To get a file’s size, you can use wc -c to get the size (file length) in bytes: In this case, it sounds like that’s what you want. But FYI, if you want to know how much disk space the file is using, you could use du -k to get the size (disk space used) in kilobytes:
How to conditionally perform command in CMD shell?
If the condition is met then Command1 will run, and its output will be piped to Command2. Placing an IF command on the right hand side of a pipe is also possible but the CMD shell is buggy in this area and can swallow one of the delimiter characters causing unexpected results. Echo Y | IF red==blue del *.log Chaining IF commands (AND).
How to check the size of a file using Bash?
For getting the file size in both Linux and Mac OS X (and presumably other BSDs), there are not many options, and most of the ones suggested here will only work on one system. cut -d’ ‘ -f1 doesn’t work because on Mac, the number may be right-aligned, padded with spaces in front.
When is the condition not to perform a command?
NOT Perform the command if the condition is false. == Perform the command if the two strings are equal.