gluzangi

Trick and Tips on tech-adventures

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Text Manipulation

26 Feb 2016

WHILE loop:

while read line; do (echo $line); done

FOR loop:

for name in {1..10}.txt; do touch $name; done

Read A Line On A File:

$ cat file.txt | while read line; do (echo $line); done
cut -d":" -f1 -s /etc/group | (while read line; do sudo chown -R $line.$line ./$line; done)
cut -d":" -f1 -s /home/ec2-user/passwd | while read line; do sudo chown -R $line.$line /home/$line ; done
cut -d"/" -f3 DreamPunsDBSST.list | while read line; do mv ./DreamParkDB/$line ./DreamPunsDBSST/$line; done

Read the mailboxes lines and copy to archive directory

cat mailboxes.txt | while read line; do cp ./mail/$line ./mail_archives/ ; done

Substitution:

replace ‘cat’ by ‘dog’ in file in.txt and output it to file out.txt the ‘g’ means replace all matches, not just the first on a given line

sed -e 's/cat/dog/g' in.txt > out.txt

Batch File Rename:

for file in *.* ; do mv [SOURCE_NAME] [DEST_NAME]; done

Batch File Rename Ext:

for file in *.bkp
do
mv $file `basename $filename .bkp`;
done

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