Bash Syntax error redirection unexpected

Question

I do this in a script   read direc  lt  lt  lt    basename  pwd     and I get   Syntax error  redirection unexpected   in an ubuntu machine   bin bash --version GNU bash  version 4 0 33 1 -release  x86 64-pc-linux-gnu    while I do not get this error in another suse machine    bin bash --version GNU bash  version 3 2 39 1 -release  x86 64-suse-linux-gnu  Copyright  C  2007 Free Software Foundation  Inc    Why the error

User · Answer

If you re using the following to run your script   sudo sh   script sh   Then you ll want to use the following instead   sudo bash   script sh   The reason for this is that Bash is not the default shell for Ubuntu  So  if you use  sh  then it will just use the default shell  which is actually Dash  This will happen regardless if you have    bin bash at the top of your script  As a result  you will need to explicitly specify to use bash as shown above  and your script should run at expected   Dash doesn t support redirects the same as Bash

User · Answer

Before running the script  you should check first line of the shell script for the interpreter   Eg   if scripts starts with  bin bash   run the script using the below command   bash script name sh   if script starts with  bin sh  run the script using the below command  sh script name sh     sample sh - This will detect the interpreter from the first line of the script and run   Different Linux distributions having different shells as default

User · Answer

Another reason to the error may be if you are running a cron job that updates a subversion working copy and then has attempted to run a versioned script that was in a conflicted state after the update

User · Answer

Does your script reference  bin bash or  bin sh in its hash bang line  The default system shell in Ubuntu is dash  not bash  so if you have    bin sh then your script will be using a different shell than you expect  Dash does not have the  lt  lt  lt  redirection operator

User · Answer

On my machine  if I run a script directly  the default is bash   If I run it with sudo  the default is sh   That   s why I was hitting this problem when I used sudo

User · Answer

You can get the output of that command and put it in a variable  then use heredoc  for example   nc -l -p 80  lt  lt  lt   tested like a charm     can be written like   nc -l -p 80  lt  lt EOF tested like a charm EOF   and like this  this is what you want    text  tested like a charm  nc -l -p 80  lt  lt EOF  text EOF   Practical example in busybox under docker container   kasra ubuntu    docker run --rm -it busybox     nc -l -p 80  lt  lt  lt   tested like a charm   sh  syntax error  unexpected redirection       nc -l -p 80  lt  lt EOL  gt  tested like a charm  gt  EOL  Cpunt          gt  socket listening  no errors   Cpunt  is result of CTRL C signal        text  tested like a charm      nc -l -p 80  lt  lt EOF  gt   text  gt  EOF  Cpunt

User · Answer

In my case error is because i have put      twice   mongodump --db  DB NAME --collection  col --out  BACKUP LOCATION  DB NAME- BACKUP DATE  gt  gt   gt  gt   LOG PATH   i just correct it as   mongodump --db  DB NAME --collection  col --out  BACKUP LOCATION  DB NAME- BACKUP DATE  gt  gt   LOG PATH

User · Answer

do it the simpler way   direc   basename  pwd     Or use the shell    direc   PWD

User · Answer

Docker   I was getting this problem from my Dockerfile as I had   RUN bash  lt   lt  curl -s -S -L https   raw githubusercontent com moovweb gvm master binscripts gvm-installer    However  according to this issue  it was solved      The exec form makes it possible to avoid shell string munging  and   to RUN  commands using a base image that does not contain  bin sh       Note      To use a different shell  other than  bin sh  use the exec form   passing in the desired shell  For example   RUN    bin bash    -c    echo hello        Solution   RUN    bin bash    -c    bash  lt   lt  curl -s -S -L https   raw githubusercontent com moovweb gvm master binscripts gvm-installer      Notice the quotes around each parameter

[bash] Bash: Syntax error: redirection unexpected

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