> I'm supposing the OP wants to know how to use system or `backticks` in Perl, because calling CLI programs directly is interwoven into bash

LanX, given your insightful "that's similar to how I migrated from Bash to Perl" reply to this node's "Perl" code:

system ('grep -l "DATAmessage.*3\.0" *.xml > 3.0_files_arraydata.txt')
+; 
system ("mv temp_3.0_files_onixarraydata.txt 3.0_files_arraydata.txt")
+;  
system ("cat *files_arraydata.txt > data2.txt");
system ("rm data2.txt");
[download]

it seems you would know. :-)

Once the OP posts the working bash script, I trust we could rewrite it in Perl a bit more cleanly than the above monstrosity.

See Also

• Unix shell versus Perl
• Troubleshooting and Logging/Debugging References

• hippo's classic poem: The wise coder
• useless use of cat and other awards

References Added Later

• Using system (); with Strawberry Perl by hadrons (2021) - seeks advice converting a Perl script heavy in its use of system to pure Perl
• how perl do 'envsubst' by vincentaxhe (2024) - converting a bash script using the Linux envsubst command to perl
• Commify function regex in Perl vs sed by harangzsolt33 (2025) - wants to port some Perl code to bash

• envsubst - Linux envsubst command (typically usr/bin/envsubst)
• GNU gettext envsubst - envsubst is part of the GNU gettext utilities
• How to substitute shell variables in complex text files (SO) - some examples using the Linux envsubst command
• SO question - first answer offers a crude Perl alternative to envsubst namely perl -pe 'while (my ($k, $v) = each %ENV) { s/\$$k/$v/g }'

Updated: many references were added long after the original reply was made

👁️🍾👍🦟