Bash – Append files with bash one-liner

bashshellshell-script

Currently I use multiple lines to append content into a combined file, e.g.

./myprogram 1.txt > Out.txt # Overwrite for the 1st file
./myprogram 2.txt >> Out.txt
./myprogram 3.txt >> Out.txt
./myprogram 4.txt >> Out.txt

Is it possible to replace by one-liner?

Best Answer

(./myprogram 1.txt; ./myprogram 2.txt; ./myprogram 3.txt; ./myprogram 4.txt) > out.txt

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As slm already indicated you can test for $f to be a regular file. While learning I would change the script to not be a one liner, they tend to be harder to read and maintain:

for f in *
do 
  if [ -f "$f" ]
  then
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  fi 
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(you can always fold this later by inserting ; and deleting newlines)

The -f tests the argument to be a regular file (not a device or directory), there are other tests as well (-d for directory e.g, so you could test if [ ! -d "$f" ] as well in this case).

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sqlite3 clipboard_archive.db "PRAGMA journal_mode = OFF; insert into cb (cb_context) values ('clipboard');"

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