I have a directory containing thousands of files with names
t_00xx_000xxx.png and 00xx_000xxx.png. I want to change the names of the files which starts with t_, like t_00xx_000xxx.png to 00xx_000xxx_t.png
So take the prefix and put it as a postfix for some of the files. Can this be done in only one command?
I am running on SUSE SLES12 SP2.
Given the filename pattern t_00xx_000xxx.png where the x's could be any single character, the following loop uses the ? globbing character substitute for the variable characters. The loop picks up only files that start with t_ and that end in .png. It uses parameter expansion to strip off the leading t_, then extracts the desired substring in order to move the _t into the desired position.
for f in t_00??_000???.png
do
echo mv -- "$f" "${f:2:11}_t.png"
done
For some made-up filenames, the sample output is:
mv t_0011_000111.png 0011_000111_t.png
mv t_0012_000345.png 0012_000345_t.png
mv t_00xx_000xxx.png 00xx_000xxx_t.png
Remove the echo portion if the results look correct.
In sh syntax:
for f in t_*.*; do
dest=${f#t_}
dest=${dest%.*}_t.${dest##*.}
echo mv -i -- "$f" "$dest"
done
If SuSE SLES12 has mcp/mmv command in its repository, then it would be simple use of mmv:
mmv 't_*.png' '#1_t.png'
Or, if the number of characters and specific numbers was issue, you could be more specific like:
mmv 't_00??_000???.png' '00#1#2_000#3#4#5_t.png'
First argument to mmv is source, with standard wildcards * and ?. The second argument is destination, in which #1 is replaced with content which first wildcard matched, #2 with content which second wildcard matched etc.
Example:
% ls -1
t_0011_000037.png
t_0011_000038.png
t_0011_000039.png
t_0022_000001.png
t_0022_000002.png
% mmv 't_*.png' '#1_t.png'
% ls -1
0011_000037_t.png
0011_000038_t.png
0011_000039_t.png
0022_000001_t.png
0022_000002_t.png
This will work if we assume everything up to the first underscore to be the prefix.
for f in *.png; do
new=$(echo "$f" | sed -r 's/^([^_]*)_(.*)\.(.*)$/\2_\1.\3/');
echo "Renaming: $f => $new";
#mv $f $new
done
Remove the # in front of mv if you're happy with the output.
With prename it would be a little easier:
prename -n 's/^([^_]*)_(.*)\.(.*)$/$2_$1.$3/'
If t_ is always the prefix, change to this pattern:
for f in t_*.png; do
new=$(echo "$f" | sed -r 's/^t_(.*)\.(.*)$/\1_t.\2/');
echo "Renaming: $f => $new";
#mv $f $new
done
t_ the prefix ?
t_ and files with not, so I need to perform this operation on only files with t_ ... I would say that I replace this for f in *.png; do with for f in t_*.png; do, right ? or what do you think ?
prenameand no admin rights to install anything.t_*, I can usemvcommand, something likemv t_* *_twhere * is a single filename within the loopmvdoesn't work like that. It's going to take*_tas a directory name then give you an error when it doesn't exist.