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source is command to execute other shell commands, so if you say
source foo
it will try to run the command foo (alias in this case)
If foo is a script why are you using source command to run...

try this: This will remove all the spaces and replace it with an underscore and then rename them

ls -1 "t_ "* | while read filename ; do flnm=`echo "$filename" | tr -s " " "_"`; cp "$filename"...

Use this code. Just one line would do the job for you
nawk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=2 a=0 s="comp" file.txt

You can change the "b" and...