Bash syntax error Post: 302917458

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Top Forums Shell Programming and Scripting Bash syntax error Post 302917458 by junior-helper on Tuesday 16th of September 2014 08:46:40 PM

09-16-2014

Registered User

The first thing I've noticed is the missing shebang/hashbang (something like #!/bin/bash) in the very first line.

cd /$line/ I think the first slash should be removed, unless you're running this script from the root "/" directory.

set a=`grep ENDMDL my_docking.pdb | wc -l` should not work in bash. Try a=`grep ENDMDL my_docking.pdb | wc -l` instead.

Demonstration:

Code:

$ set a=`uname`
$ echo $a

$ a=`uname`
$ echo $a
Linux
$

Quote:

Originally Posted by chrisjorg

What's the difference ...

$line: variable will expand
"$line": variable will expand safely, e.g. preserving whitespaces in filenames (good practice + recommended)
'$line': variable will *not* expand, it's treated as a *literal* string $line

Demonstration:

Code:

$ test -d "VirtualBox VMs"
$ echo $?
0
$ 
$ for name in "VirtualBox VMs"; do ls $name; done
ls: cannot access VirtualBox: No such file or directory
ls: cannot access VMs: No such file or directory
$ 
$ for name in "VirtualBox VMs"; do ls "$name"; done
testvm1
$ 
$ for name in "VirtualBox VMs"; do ls '$name'; done
ls: cannot access $name: No such file or directory
$

Most likely, '{'$b'}' also needs to be replaced by either ${b} or "$b"

HTH

junior-helper

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)