I am relatively new to bash and I am testing my code for the first case.
counter=1
for file in not_processed/*.txt; do
if [ $counter -le 1 ]; then
grep -v '2018-07' $file > bis.txt;
counter=$(($counter+1));
fi;
done
I want to subtract all the lines containing '2018-07' from my file. The new file needs to be named $file_bis.txt.
Thanks
With sed or awk it's much easier and faster to process complex files.
sed -n '/2018-07/p' not_processed/*.txt
then you get the output in your console. If you want you can pipe the output to a new file.
sed -n '/2018-07/p' not_processed/*.txt >> out.txt
easier and faster depends on use case.. grep would be faster here as well as more compact.. grep '2018-07'This is to do it on all files in not_processed/*.txt
for file in not_processed/*.txt
do
grep -v '2018-07' $file > "$file"_bis.txt
done
And this is to do it only on the first 2 files in not_processed/*.txt
for file in $(ls not_processed/*.txt|head -2)
do
grep -v '2018-07' $file > "$file"_bis.txt
done
Don't forget to add "" on $file, because otherwise bash considers $file_bis as a new variable, which has no assigned value.
I don't understood why you are using a counter and if condition for this simple requirement. Use below script which will fulfill you requirement:-
#first store all the files in a variable
files=$(ls /your/path/*.txt)
# now use a for loop
for file in $files;
do
grep '2018-07' $file >> bis.txt
done
Better avoid for loop here as below single line is suffice
grep -h '2018-07' /your/path/*.txt > bis.txt
for file in /your/path/*.txt reliably.. and no need for loop when you can do grep '2018-07' /your/path/*.txt (unless there are too many files)for loop. I have modified my answer with your suggestion. Thanks for your comment and advice.
grep xxx file1 file2 will put "file1:" or "file2:" at the start of matching lines, while grep xxx file1 won't, by default. Use the -H option to force the name to be added to output lines, or -h to suppress the name.
sedcommand in linux for this purposegrep -vmatches with your textsubtractbut you have accepted an answer that does opposite.. also, not sure why you are usingcounterin your script