Using a shell script to write the names of all executables in a folder, with formatting, to a text file?

Question

I have about 200 C files that I need to format to a text file like so:

sem_post_stress.c
dup_fdopendir.c
shm_open.c and 198 others...

after making the files, the binaries are stored in ./aarch64/le/ along with .o and .dep.

I need to create a text file used at startup to make my image with the ~200 binaries, formatted like so, one line per binary:

/tmp/sem_post_stress = /home/.../.../.../.../aarch64/le/sem_post_stress

/tmp/dup_fdopendir = /home/.../.../.../.../aarch64/le/dup_fdopendir

/tmp/shm_open = /home/.../.../.../.../aarch64/le/shm_open

From this link: https://www.redhat.com/sysadmin/bash-scripting-loops

I know how to rename all files like: for i in $(ls *.); do but not how to add a prefix for my qemu environment "/tmp/" or the rest, = and absolute path.

I'm new to bash and never use it so I apologize if this is trivial, I have looked everywhere. Any hints or code is greatly appreciated!

Answer 1

With zsh:

(for file (aarch64/le/*(N*)) print -r /tmp/$file:t = $file:P) > file.out

Where:

• aarch64/le/*(N*) expands to the list of non-hidden executable regular files in aarch64/le, (N*) being glob qualifiers, Nullglob for the list to expand to nothing if there's no match, * to select executable files (mnemonic: same as the prefix ls -F uses for executable files).
• $var:t takes the tail of a path (its basename).
• $var:P takes the realPath of a path (its absolute, canonical, symlink free path as the realpath() standard function or realpath command does).

With GNU find and any shell (even bash, the GNU shell):

LC_ALL=C find "$PWD/aarch64/le/" -maxdepth 1 ! -name '.*' -executable -type f \
  -printf '/tmp/%f = %p\n' > file.out

Beware contrary to the zsh approach, that gives an unsorted list.

POSIXly with standard sh and utilities:

for file in aarch64/le/*; do
  if [ -x "$file" ] && [ -f "$file" ] && [ ! -L "$file" ]; then
    printf '%s\n' "/tmp/${file##*/} = $PWD/$file"
  fi
done > file.out

(also works in zsh and bash though note that in zsh (or bash if the failglob option is set), if there's no non-hidden file in aarch64/le/, you'll get an error).