用下划线替换目录中所有文件中的空格

Question

I have found some similar questions here but not this specific one and I do not want to break all my files. I have a list of files and I simply need to replace all spaces with underscores. I know this is a sed command but I am not sure how to generically apply this to every file.

I do not want to rename the files, just modify them in place.

Edit: To clarify, just in case it's not clear, I only want to replace whitespace within the files, file names should not be changed.

Answer 1

find . -type f -exec sed -i -e 's/ /_/g' {} \;

find grabs all items in the directory (and subdirectories) that are files, and passes those filenames as arguments to the sed command using the {} \\; notation. The sed command it appears you already understand.

if you only want to search the current directory, and ignore subdirectories, you can use

find . -maxdepth 1 -type f -exec sed -i -e 's/ /_/g' {} \;

Answer 2

This is a 2 part problem. Step 1 is providing the proper sed command, 2 is providing the proper command to replace all files in a given directory.

Substitution in sed commands follows the form s/ItemToReplace/ItemToReplaceWith/pattern , where s stands for the substitution and pattern stands for how the operation should take place. According to this super user post , in order to match whitespace characters you must use either \\s or [[:space:]] in your sed command. The difference being the later is for POSIX compliance. Lastly you need to specify a global operation which is simply /g at the end. This simply replaces all spaces in a file with underscores. Substitution in sed commands follows the form s/ItemToReplace/ItemToReplaceWith/pattern , where s stands for the substitution and pattern stands for how the operation should take place. According to this super user post , in order to match whitespace characters you must use either just a space in your sed command, \\s , or [[:space:]] . The difference being the last 2 are for whitespace catching (tabs and spaces), with the last needed for POSIX compliance. Lastly you need to specify a global operation which is simply /g at the end.

Therefore, your sed command is

sed s/ /_/g FileNameHere

However this only accomplishes half of your task. You also need to be able to do this for every file within a directory. Unfortunately, wildcards won't save us in the sed command, as * > * would be ambiguous. Your only solution is to iterate through each file and overwrite them individually. For loops by default should come equipped with file iteration syntax , and when used with wildcards expands out to all files in a directory. However sed's used in this manner appear to completely lose output when redirecting to a file. To correct this, you must specify sed with the -i flag so it will edit its files. Whatever item you pass after the -i flag will be used to create a backup of the old files. If no extension is passed ( -i '' for instance), no backup will be created.

Therefore the final command should simply be

for i in *;do sed -i '' 's/ /_/g' $i;done

Which looks for all files in your current directory and echos the sed output to all files (Directories do get listed but no action occurs with them).

Answer 3

好吧……由于我一直想让某件事运行，所以我找到了一种对我有用的方法：

for file in `ls`; do sed -i 's/ /_/g' $file; done