UNIX for Beginners Questions & Answers

set -vx

for i in ~/Shell_Practice/rename/*.txt 
do  
    t=`(echo $i | awk gsub("file","newfile"))`
    mv $i $t
 done

atomic@atomic-VirtualBox:~/Shell_Practice/rename$ ./rename.sh

for i in ~/Shell_Practice/rename/*.txt 
do  
    t=`(echo $i | awk gsub("file","newfile"))`
    mv $i $t
 done
++ for i in ~/Shell_Practice/rename/*.txt
./rename.sh: command substitution: line 5: syntax error near unexpected token `('
./rename.sh: command substitution: line 5: `(echo $i | awk gsub("file","newfile"))'
++ t=
++ mv /home/atomic/Shell_Practice/rename/file10.txt
mv: missing destination file operand after '/home/atomic/Shell_Practice/rename/file10.txt'
Try 'mv --help' for more information.
++ for i in ~/Shell_Practice/rename/*.txt
./rename.sh: command substitution: line 5: syntax error near unexpected token `('
./rename.sh: command substitution: line 5: `(echo $i | awk gsub("file","newfile"))'
++ t=
++ mv /home/atomic/Shell_Practice/rename/file1.txt
mv: missing destination file operand after '/home/atomic/Shell_Practice/rename/file1.txt'
 Try 'mv --help' for more information.

atomic@atomic-VirtualBox:~/Shell_Practice/rename$ ls
file10.txt  file2.txt  file4.txt  file6.txt  file8.txt  rename.sh
file1.txt   file3.txt  file5.txt  file7.txt  file9.txt