Add example with input and output files

examples/README.md

@@ -65,9 +65,9 @@ Jobs processed: 1, successfully retrieved: 1, successfully cleaned: 1
 
 ## Submit, query and retreive your own jobs
 
-The command [`arcsub`](https://www.nordugrid.org/arc/arc6/users/client_tools.html#arcsub) allows you to submit a job given its description. One of the job description languages supported by ARC6 is the **extended Resource Specification Language (xRSL)**, described [here](https://www.nordugrid.org/arc/arc6/users/xrsl.html). We will be using that language to describe the jobs we use in these examples.
+The command [`arcsub`](https://www.nordugrid.org/arc/arc6/users/client_tools.html#arcsub) allows you to submit a job given its description. One of the job description languages supported by ARC6 is the **extended Resource Specification Language (xRSL)**, described [here](https://www.nordugrid.org/arc/arc6/users/xrsl.html). We will describe our example jobs using that language.
 
-To submit a job which will execute `/usr/bin/env` and store its results in file `stdout` we can use the description included in file `arc-env.xrsl`:
+File `arc-env.xrsl` contains the description of a job which executes `/usr/bin/env` and store its results in file `stdout`:
 
 ```bash
 $ cat arc-env.xrsl
@@ -77,7 +77,11 @@ $ cat arc-env.xrsl
  ( stdout = "stdout" )
  ( join = "yes" )
  ( gmlog = "gmlog" )
+```
+
+To submit this job use the command
 
+```bash
 $ arcsub -C $ARC_CE arc-env.xrsl
 Job submitted with jobid: https://ccarccelsst01.in2p3.fr:9443/arex/lJPNDmDMZz0n3NnJ7oI0cbupABFKDmABFKDmbRGKDmFBFKDmAQSF3n
 ```
\ No newline at end of file

examples/arc-search-for-pattern.xrsl

+&( executable = "search-for-pattern.sh" )
+ (  arguments = "bbb data.txt output.txt" )
+ ( inputFiles = 
+    ( "data.txt" "" )
+ )
+ ( outputFiles = 
+    ( "output.txt" "" )
+ )
+ (      queue = "flash" )
+ (    jobname = "arc-search-flash" )
+ (     stdout = "stdout" )
+ (       join = "yes" )
+ (      gmlog = "gmlog" )

examples/data.txt

+aaa
+bbb
+ccc
+ddd
+eee 
+fff
+ggg
+hhh
+iii
+jjj
\ No newline at end of file

examples/search-for-pattern.sh

+#!/bin/bash
+
+# Usage: search-for-pattern.sh <pattern> <input file> <output file> 
+
+thisScript=$(basename $0)
+
+function usage() {
+    local name=$1
+    echo "Usage: ${name} <pattern> <input file> <output file> "
+}
+
+# Parse command line
+pattern=$1
+inputFile=$2
+outputFile=$3
+
+if [[ -z ${pattern} || -z ${inputFile} || -z ${outputFile} ]]; then
+    usage ${thisScript}
+    exit 1
+fi
+
+echo "Arguments: $*"
+echo "Execution hostname: $(hostname -f)"
+echo "Working directory: $(pwd)"
+echo "Contents of working directory before execution:"
+ls -al $(pwd)
+
+# Ensure the input file exists
+if [ ! -f ${inputFile} ]; then
+    echo "${thisScript}: could not find file ${inputFile} in working directory"
+    exit 1
+fi
+
+# Search pattern in input file and store the results in output file
+grep "${pattern}" ${inputFile} > ${outputFile}
+
+echo "Contents of working directory after execution:"
+ls -al $(pwd)