[BashShell program design] when whileread encounters ssh

[BashShell program design] when whileread encounters ssh, first read a simplified BASHSHELL code TODAY 'date + % Y % m % d' SUFFIX & quot; tar & quot; CONFthe_config_filei0whilereadHOSTSRCPATHDSTPATHdo (I ++ )) [Bash Shell program design] when while read encounters ssh, first look at a simplified bash shell code TODAY = 'date + % Y % m % d' SUFFIX = "tar" CONF = the_config_file I = 0 while read host srcpath dstpath do (I ++ )) if ["X $ {HOST: 0: 1} "=" X # "-o $ {# DSTPATH}-eq 0] then # ignore annotation lines and records with less than three items else ssh $ {HOST}" tar c $ {SRCPATH} ">$ {DSTPATH }. $ {TODAY }. $ {SUFFIX} 2>/dev/null fi done <$ CONF the author intended to read the configuration file $ CONF through a script, and then package and back up the file specified in $ CONF, after the program is executed, it is found that the program will exit after successfully backing up the first file specified in $ CONF ...... After tracking, it is found that no data is read after the first file is backed up, so the while loop ends -- that is, ssh $ {HOST} "tar c $ {SRCPATH}" >$ {DSTPATH }. $ {TODAY }. $ {SUFFIX} 2>/dev/null. Change it to ssh $ {HOST} "tar c $ {SRCPATH}" >$ {DSTPATH}. $ {TODAY}. $ {SUFFIX} 2>/dev/null