Calculate Size of Files in Shell

Calculate size of files in shell

Try:

find . -name "*.undo" -ls | awk '{total += $7} END {print total}'

On my system the size of the file is the seventh field in the find -ls output. If your find … -ls output is different, adjust.

In this version, using the existing directory information (file size) and the built-in ls feature of find should be efficient, avoiding process creations or file i/o.

bash script: calculate sum size of files

Ultimately, as other answers will point out, it's not a good idea to parse the output of ls because it may vary between systems. But it's worth knowing why the script doesn't work.

The ambiguous redirect error is because you need quotes around your ls command i.e.:

while IFS='' read -r line || [[ -n "$line" ]]; do
  echo $line
done < "`ls -l | grep opencv | awk '{print $5}'`"

But this still doesn't do what you want. The "<" operator is expecting a filename, which is being defined here as the output of the ls command. But you don't want to read a file, you want to read the output of ls. For that you can use the "<<<" operator, also known as a "here string" i.e.:

while IFS='' read -r line || [[ -n "$line" ]]; do
    echo $line
done <<< "`ls -l | grep opencv | awk '{print $5}'`"

This works as expected, but has some drawbacks. When using a "here string" the command must first execute in full, then store the output of said command in a temporary variable. This can be a problem if the command takes long to execute or has a large output.

IMHO the best and most standard method of iterating a commands output line by line is the following:

ls -l | grep opencv | awk '{print $5} '| while read -r line ; do
    echo "line: $line"
done

linux command to get size of files and directories present in a particular folder?

Use ls command for files and du command for directories.

Checking File Sizes

ls -l filename   #Displays Size of the specified file
ls -l *          #Displays Size of All the files in the current directory
ls -al *         #Displays Size of All the files including hidden files in the current directory
ls -al dir/      #Displays Size of All the files including hidden files in the 'dir' directory

ls command will not list the actual size of directories(why?). Therefore, we use du for this purpose.

Checking Directory sizes

du -sh directory_name    #Gives you the summarized(-s) size of the directory in human readable(-h) format
du -bsh *                #Gives you the apparent(-b) summarized(-s) size of all the files and directories in the current directory in human readable(-h) format

Including -h option in any of the above commands (for Ex: ls -lh * or du -sh) will give you size in human readable format (kb, mb,gb, ...)

For more information see man ls and man du

Get total size of a list of files in UNIX

You should simply be able to pass $file_list to du:

du -ch $file_list | tail -1 | cut -f 1

du options:

• -c display a total
• -h human readable (i.e. 17M)

du will print an entry for each file, followed by the total (with -c), so we use tail -1 to trim to only the last line and cut -f 1 to trim that line to only the first column.

total size of group of files selected with 'find'

The command du tells you about disk usage. Example usage for your specific case:

find rapidly_shrinking_drive/ -name "offender1" -mtime -1 -print0 | du --files0-from=- -hc | tail -n1

(Previously I wrote du -hs, but on my machine that appears to disregard find's input and instead summarises the size of the cwd.)

Short command to find total size of files matching a wild card

Try du to summarize disk usage:

du -csh *.jpg

Output (for example):

8.0K sane-logo.jpg
16K sane-umax-advanced.jpg
28K sane-umax-histogram.jpg
24K sane-umax.jpg
16K sane-umax-standard.jpg
4.0K sane-umax-text2.jpg
4.0K sane-umax-text4.jpg
4.0K sane-umax-text.jpg
104K total

du does not summarize the size of the files but summarizes the size of the used blocks in the file system. If a file has a size of 13K and the file system uses a block size of 4K, then 16K is shown for this file.

How to find the size of a file and assign it to a variable in Unix

You can use the stat command which eliminates the need to use AWK.

For example, in Linux with Bash where myfile is your file path:

sz=$(stat -c '%s' myfile)
if [ $sz -eq 100 ]; then
    echo "myfile is 100 bytes"
fi

Take note of the equality command -eq that's the arithmetic binary operator in Bash.

Alternatively, you can use a variable for the file path:

f=my/file/path
sz=$(stat -c '%s' $f)
if [ $sz -eq 100 ]; then
    echo "$f is 100 bytes"
fi

Check folder size in Bash

You can do:

du -hs your_directory

which will give you a brief output of the size of your target directory. Using a wildcard like * can select multiple directories.

If you want a full listing of sizes for all files and sub-directories inside your target, you can do:

du -h your_directory

Tips:

• Add the argument -c to see a Total line at the end. Example: du -hcs or du -hc.

• Remove the argument -h to see the sizes in exact KiB instead of human-readable MiB or GiB formats. Example: du -s or du -cs.

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