I need a command to rename all files in the current working directory, in a way that the new filename will be the same as the old, but including a suffix corresponding to the number of lines of the original files (e.g. if the file f has 10 lines then it should be renamed to f_10).
Here's my (non-working) attempt:
linenum=$(wc -l); find * -type f | grep -v sh | rename 's/^/ec/'*
How about:
for f in *; do mv "$f" "$f"_$(wc -l < "$f"); done
For example:
$ wc -l *
10 file1
40 file2
100 file3
$ ls
file1_10 file2_40 file3_100
If you want to keep extensions (if present), use this instead:
for f in *; do
ext="";
[[ $f =~ \. ]] && ext="."${f#*.};
mv "$f" "${f%%.*}"_$(wc -l < "$f")$ext;
done
You can try this one liner:
find . -maxdepth 1 -type f -exec bash -c 'mv -i "$1" "$1.$(wc -l <"$1")"' _ {} \;
This will find all files in the current working directory (find . -maxdepth 1 -type f)
Then we are running a shell instance over the files found to rename the files to append the number of lines.
Example :
$ ls
bar.txt spam.txt foo.txt
$ find . -maxdepth 1 -type f -exec bash -c 'mv -i "$1" "$1.$(wc -l <"$1")"' _ {} \;
$ ls
bar.txt.12 foo.txt.24 spam.txt.7
Another way which preserves the extension (if present) using rename:
for f in *; do rename -n "s/([^.]+)(\.?.*)/\$1_$(< "$f" wc -l)\$2/" "$f"; done
If the result is the expected one, remove the -n option:
for f in *; do rename "s/([^.]+)(\.?.*)/\$1_$(< "$f" wc -l)\$2/" "$f"; done
Using find:
find . -maxdepth 1 -type f -print0 | while read -d $'\0' f; do mv "$f" "$f"_$(grep -c . "$f"); done
Example
% wc -l *
3 doit
5 foo
% find . -maxdepth 1 -type f -print0 | while read -d $'\0' f; do mv "$f" "$f"_$(grep -c . "$f"); done
% wc -l *
3 doit_3
5 foo_5
Just for fun and giggles a solution with rename. Since rename is a Perl tool that accepts an arbitrary string that is eval'd, you can do all sorts of shenanigans. A solution that seems to work is the following:
rename 's/.*/open(my $f, "<", $_);my $c=()=<$f>;$_."_".$c/e' *
The script bellow covers multiple cases: the single dot and extension (file.txt), multiple dots and extensions(file.1.txt), consecutive dots (file..foobar.txt), and dots in the filename (file. or file..).
The Script
#!/bin/bash
# Author: Serg Kolo
# Date: June 25,2015
# Description: script to rename files to file_numlines
# written for http://askubuntu.com/q/640430/295286
# Where are the files ?
WORKINGDIR=/home/xieerqi/substitutions
# Where do you want them to go ?
OUTPUTDIR=/home/xieerqi/substitutions/output
for file in $WORKINGDIR/* ;do
FLAG=0
EXT=$(printf "%s" "$file" | awk -F'.' '{printf "%s",$NF }' ) # extension, last field of dot-separated string
# EXT="${file##*.}" # Helio's advice is to use parameter expansion, but I dont know how to use it
if [ -z $EXT ]; then # we have a dot at the end case file. or something
# so we gotta change extension and filename
EXT=""
FILENAME=$(printf "%s" "$file" | awk -F '/' '{ print $NF}' )
# set flag for deciding how to rename
FLAG=1
else
FILENAME=$( printf "%s" "$file" | awk -F '/' -v var=$EXT '{gsub("."var,"");print $NF}' ) # filename, without path, lst in
fi
NUMLINES=$(wc -l "$file" | awk '{print $1}') # line count
if [ $FLAG -eq 0 ];then
echo "$file" renamed as "$OUTPUTDIR"/"$FILENAME"_"$NUMLINES"."$EXT"
# cp "$file" "$OUTPUTDIR"/"$FILENAME"_"$NUMLINES"."$EXT" # uncomment when necessary
else
echo "$file" renamed as "$OUTPUTDIR"/"$FILENAME"_"$NUMLINES""$EXT"
# cp "$file" "$OUTPUTDIR"/"$FILENAME"_"$NUMLINES""$EXT" # uncomment when necessary
fi
#printf "\n"
done
Script in action
$./renamer.sh
/home/xieerqi/substitutions/file. renamed as /home/xieerqi/substitutions/output/file._0
/home/xieerqi/substitutions/file.. renamed as /home/xieerqi/substitutions/output/file.._0
/home/xieerqi/substitutions/file.1.jpg renamed as /home/xieerqi/substitutions/output/file.1_3.jpg
/home/xieerqi/substitutions/file.1.test.jpg renamed as /home/xieerqi/substitutions/output/file.1.test_3.jpg
/home/xieerqi/substitutions/file.1.test.txt renamed as /home/xieerqi/substitutions/output/file.1.test_2.txt
/home/xieerqi/substitutions/file.1.txt renamed as /home/xieerqi/substitutions/output/file.1_2.txt
/home/xieerqi/substitutions/file.2.jpg renamed as /home/xieerqi/substitutions/output/file.2_3.jpg
/home/xieerqi/substitutions/file.2.test.jpg renamed as /home/xieerqi/substitutions/output/file.2.test_3.jpg
/home/xieerqi/substitutions/file.2.test.txt renamed as /home/xieerqi/substitutions/output/file.2.test_2.txt
/home/xieerqi/substitutions/file.2.txt renamed as /home/xieerqi/substitutions/output/file.2_2.txt
/home/xieerqi/substitutions/foo..bar.txt renamed as /home/xieerqi/substitutions/output/foo..bar_4.txt
Note that there is no lines in file. and file.. , hence line count is 0
Special thanks to terdon and Helio for reviewing the script and suggested edits
Another bash way, developed with @Helio in chat:
for file in *
do
echo "$file"
[[ -f "$file" ]] || continue
[[ $file =~ (.*)(\.[^.]+)$ ]]
cp "$file" "output/${BASH_REMATCH[1]:-$file}_$(wc -l < "$file")${BASH_REMATCH[2]}"
done
The weird looking monocled guy with a stunted second head ((.*)(\.[^.]+)$) should match only proper extensions (.foo, not ..). If there's no extension, then the BASH_REMATCH array will be empty. We can take advantage of this by using a default value for the filename ${BASH_REMATCH[1]:-$file}, and just using the extension as is.
To handle dot files, you could use find, as suggested by terdon and Helio.
find -maxdepth 1 -type f -printf '%P\0' |
while IFS= read -r -d '' file
do
[[ $file =~ (.*)(\.[^.]+)$ ]]
cp "$file" "output/${BASH_REMATCH[1]:-$file}_$(wc -l < "$file")${BASH_REMATCH[2]}"
done
