how to direct scp output to a file in bash shell or script

Shell Programming and Scripting
1

I can run this from the command line:
scp -i identfile /path/file_to_send remotelogin@remotebox:/path_to_put_it/file_to_send

and I get:
file_to_send 100% |***************************************************************************| 0 00:00

but if I do:
scp -i identfile /path/file_to_send remotelogin@remotebox:/path_to_put_it/file_to_send > logfile

I get nothing for output at the command line (which I would expect since I redirected it) and a file called logfile is created but it is empty.

I tried:
scp -i identfile /path/file_to_send remotelogin@remotebox:/path_to_put_it/file_to_send > logfile 2>&1

but still nothing...

Can someone please tell me what I am doing wrong?

2

you're doing nothing wrong.
scp detects when it's writing to a tty or a pipe or file or whatnot
and suppresses that *********** line if writing to a pipe or file.

Maybe just checking the $? status?

3

maybe someone knows how to fool scp but i don't...
i tried various things like:

echo | scp . . ..

( scp . .. . ) > log 2>&1

( thinking it was similar to "tty" ) but nothing worked.

Oh.... this worked, but I couldn't get it to work in a script:

script
scp . . .
exit

4

I can't figure anything out either... This is really bumming me out, seems like it should be easy.

5

Try running script beforehand and close it after scp'ing the file.
It won't suppress displaying it on the screen, but it will capture everything that happens during the script session.

6

can I use the script command in a bash script?

7

The following is a function that I use in a variety of my scripts to enable an SCP session within the process. It pulls its params in from a config file that is parsed elsewhere to provide to this function's call. You can swap in your own vars or even static values to get a sense of what it's doing.

SCP (or SSH, for that matter...) is not overly verbose, unless you specifically tell it to be. The terminal output you see when in the shell is not captured, most likely since it speaks to security anyway. Best bet might be to track the return code(s) and debug as needed in the case of problems. You can, however, modify the verbosity some by incrementing the verbosity switch/flag on your particular scp client. This is seen in the ${verbosity} parameter shown in the function's actual scp call:

   ###########################
   #  function SCP_mthd ... 
   #     - process SCP transfer 
function SCP_mthd 
{ 

   $_dbg_mode

   print "\n\tGreetings from SCP_mthd ($@) "                 >>${MY_LOG} 2>&1 

   #  Scrap it if there aren't sufficient params... 
   if [[ -z ${param_num1} ]] \
         || [[ -z ${param_num2} ]] \
         || [[ -z ${param_num3} ]] \
         || [[ -z ${param_num4} ]] \
         || [[ -z ${param_num5} ]] \
         || [[ -z ${param_num6} ]] 
   then 
      print "\n ===\n\n ${my_name}: $(date) "                |tee -a ${MY_LOG} 
      print "\n   ${0} called w/ invalid argument(s)... "    |tee -a ${MY_LOG} 
      print "\n                                         "    |tee -a ${MY_LOG} 
      print "\n\tCalled as: $0 ${@} \n" \
         "\tParameters: ${param_num1} \n " \
         "\t            [ -------- ]        \n "  \
         "\t            ${param_num3:-"#"}  \n "  \
         "\t            ${param_num4:-"#"}  \n "  \
         "\t            ${param_num5:-"#"}  \n "  \
         "\t            ${param_num6:-"#"}  \n "  \
         |grep -v "#"                                        |tee -a ${MY_LOG} 
      error_flag='Y' ; logger_heads ;return 2 
   fi 

   #  Hereby reserving the param_num2 column for use as an alternate IdentityFile \
   #     in SSH-based calls (ie, -i "/..." for ssh/scp, -o "/..." for sftp, etc) 
   #     -  placing "not used" string within column in .cfg file will bypass \
   #           usage of alternate file 
   if [[ ! -z ${param_num2} ]] \
      && [[ ${param_num2} != "not_used" ]] 
   then 
      typeset  host_pass=$(print ${param_num2} |tr "_" " " |tr "+" "-" ) 
   fi 
   typeset -l  host_name="${param_num3}" 
   typeset -l  host_user="${param_num4}" 
   typeset     host_dest="${param_num5}" 
   typeset     locl_path="${my_file%/*[pf][rt][nm]}" 
   typeset     locl_file="${my_file#${locl_path}/*}" 

#  print       "host_name=${host_name}" 
#  print       "host_user=${host_user}" 
#  print       "host_pass=${host_pass}" 
#  print       "host_dest=${host_dest}" 
#  print       "locl_path=${locl_path}" 
#  print       "locl_file=${locl_file}" 

   scp ${verbosity} ${host_pass} ${my_file} ${host_user}\@${host_name}\:${host_dest}\/\. \
                                                             >>${MY_LOG} 2>&1 

   rc=${?} 

   if [[ ${rc} != 0 ]] 
   then 
      print "\n ===\n\n ${my_name}: $(date) "                |tee -a ${MY_LOG} 
      print "\n   ${my_mthd} had an error... "               |tee -a ${MY_LOG} 
      print "\n                                         "    |tee -a ${MY_LOG} 
      print "\n\tCalled as: $0 ${@} \n" \
         "\tReturn Code: ${rc} \n " \                        |tee -a ${MY_LOG} 
      error_flag='Y' ; logger_heads ;return 2 
   fi 

   echo "nicely done" 

}