The /etc/ftpconversions file contains instructions that permit you to compress files on demand before the transfer.
Edit the ftpconversions file, vi /etc/ftpconversions and add in this file the following lines:
:.Z: : :/bin/compress -d -c %s:T_REG|T_ASCII:O_UNCOMPRESS:UNCOMPRESS
: : :.Z:/bin/compress -c %s:T_REG:O_COMPRESS:COMPRESS
:.gz: : :/bin/gzip -cd %s:T_REG|T_ASCII:O_UNCOMPRESS:GUNZIP
: : :.gz:/bin/gzip -9 -c %s:T_REG:O_COMPRESS:GZIP
: : :.tar:/bin/tar -c -f - %s:T_REG|T_DIR:O_TAR:TAR
: : :.tar.Z:/bin/tar -c -Z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+COMPRESS
: : :.tar.gz:/bin/tar -c -z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+GZIP
: : :.crc:/bin/cksum %s:T_REG::CKSUM
: : :.md5:/bin/md5sum %s:T_REG::MD5SUM
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Now, change its default permissions to be 600:
[root@deep ] /# chmod 600 /etc/ftpconversions
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Configure your /etc/pam.d/ftp file to use pam authentication by creating the /etc/pam.d/ftp file and add the following lines:
#%PAM-1.0
auth required /lib/security/pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed
auth required /lib/security/pam_pwdb.so shadow nullok
auth required /lib/security/pam_shells.so
account required /lib/security/pam_pwdb.so
session required /lib/security/pam_pwdb.so
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