I'm having trouble executing a Perl script through the Unix shell using Perl's system command.
I've had more complex regex commands I had to adjust accordingly to convert from Unix to Perl, and they're working fine, but I can't seem to figure out what's missing here.
I've tested with Mobaxterm v7.1 and Putty 0.60.
I have a file (file.txt):
23445 dir1/dir2/dir3
21343 dir1/dir2/dir3/dir4/file.B2
54322 dir1/dir2/dir3/file3.P
53223 dir1/dir2/dir3/dir4/dir5
23412 dir1/dir2/dir3/dir4/dir5/file5.xsd
54166 dir1/dir2/file6.AB
64544 dir1/dir2/fil7.ABE
From this file I'm trying to grep only the lines with files (exclude directories: lines 1 and 4), and store them in a new file:
system("grep '^.*\.[a-zA-Z0-9][a-zA-Z0-9]*\$' file.txt > file2.txt");
file2.txt doesn't change from file.txt and still contains the directories.
However, this command works through Unix shell (without the backslash before the $):
grep '^.*\.[a-zA-Z0-9][a-zA-Z0-9]*$' file.txt > file2.txt
file2.txt output:
21343 dir1/dir2/dir3/dir4/file.B2
54322 dir1/dir2/dir3/file3.P
23412 dir1/dir2/dir3/dir4/dir5/file5.xsd
54166 dir1/dir2/file6.AB
64544 dir1/dir2/fil7.ABE
I have to escape the $ character in the Perl system command of course so that Perl doesn't read it as an unknown string. Other than that, what needs to be adjusted in the system command?
