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I have a file whose content is 

ae-scc-san-vserver01 /vol/ae_drac02_1_oradminvg_vol/ae_drac02_1_oradminvg_lun hdisk0 fcs0 FCP 150g C ae-scc-san-vserver01 /vol/ae_drac02_1_rootvg_vol/ae_drac02_1_rootvg_lun hdisk1 fcs0 FCP 100g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskcrs03SVC_vol/ae_drac02_1_2_hdiskcrs03SVC_lun hdisk11 fcs0 FCP 16.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata01SVC_vol/ae_drac02_1_2_hdiskdata01SVC_lun hdisk12 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata02SVC_vol/ae_drac02_1_2_hdiskdata02SVC_lun hdisk13 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata03SVC_vol/ae_drac02_1_2_hdiskdata03SVC_lun hdisk14 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata04SVC_vol/ae_drac02_1_2_hdiskdata04SVC_lun hdisk15 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata05SVC_vol/ae_drac02_1_2_hdiskdata05SVC_lun hdisk17 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata06SVC_vol/ae_drac02_1_2_hdiskdata06SVC_lun hdisk18 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata12SVC_vol/ae_drac02_1_2_hdiskdata12SVC_lun hdisk19 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata13SVC_vol/ae_drac02_1_2_hdiskdata13SVC_lun hdisk20 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata14SVC_vol/ae_drac02_1_2_hdiskdata14SVC_lun hdisk21 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata15SVC_vol/ae_drac02_1_2_hdiskdata15SVC_lun hdisk22 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata16SVC_vol/ae_drac02_1_2_hdiskdata16SVC_lun hdisk23 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata17SVC_vol/ae_drac02_1_2_hdiskdata17SVC_lun hdisk24 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata18SVC_vol/ae_drac02_1_2_hdiskdata18SVC_lun hdisk25 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata19SVC_vol/ae_drac02_1_2_hdiskdata19SVC_lun hdisk26 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata20SVC_vol/ae_drac02_1_2_hdiskdata20SVC_lun hdisk27 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata21SVC_vol/ae_drac02_1_2_hdiskdata21SVC_lun hdisk28 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata22SVC_vol/ae_drac02_1_2_hdiskdata22SVC_lun hdisk29 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_swapvg_vol/ae_drac02_1_swapvg_lun hdisk3 fcs0 FCP 32.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskdata23SVC_vol/ae_drac02_1_2_hdiskdata23SVC_lun hdisk30 fcs0 FCP 250g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskfra01SVC_vol/ae_drac02_1_2_hdiskfra01SVC_lun hdisk31 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskfra02SVC_vol/ae_drac02_1_2_hdiskfra02SVC_lun hdisk32 fcs0 FCP 240.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_u01vg_vol/ae_drac02_1_u01vg_lun hdisk4 fcs0 FCP 170.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_exportsvg_vol/ae_drac02_1_exportsvg_lun hdisk5 fcs0 FCP 100g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskcrs01SVC_vol/ae_drac02_1_2_hdiskcrs01SVC_lun hdisk6 fcs0 FCP 16.0g C ae-scc-san-vserver01 /vol/ae_drac02_1_2_hdiskcrs02SVC_vol/ae_drac02_1_2_hdiskcrs02SVC_lun hdisk7 fcs0 FCP 16.0g C

I need to capture the server name. It starts with hdisk and ends with SVC. I tried the following:

sed 's/^*hdisk(.*)SVC.*/\1/' filename

I am getting this error: 

sed: 1: "s/^*hdisk(.*)SVC.*/\1/": \1 not defined in the RE

Can someone please help me on how to capture it.

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    3 Answers 3

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    1

    The problem is that hdisk...SVC occurs twice in the line, and .* is greedy.

    If you have GNU grep, you can use the -P option to get non-greedy matching:

    grep -oP '(?<=hdisk).+?(?=SVC)' file | sort -u

    outputs

    crs01 crs02 crs03 data01 data02 data03 data04 data05 data06 data12 data13 data14 data15 data16 data17 data18 data19 data20 data21 data22 data23 fra01 fra02
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      0

      You need to escape the parens (and you also need to use an asterisk or some other method to match more than one character between hdisk and SVC). e.g.:

      sed 's/^hdisk\([^\/]*\)SVC.*/\1/' filename

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      3
      • This gives me the entire row, i just need to get hdiskcrs03SVC from the entire row....as my output .....I'm not interested in other values
        – Nilesh Chaturvedi
        CommentedJan 21, 2020 at 16:23
      • 1
        @NileshChaturvedi sed -n 's/.*hdisk\(.*\)SVC.*/\1/p' filename
        – user313992
        CommentedJan 21, 2020 at 16:27
      • @NileshChaturvedi I've changed the regex to only match non-slash characters. That should work for you. You could possibly do better depending on your exact specs (like only matching alphanumeric or whatever). Or switch to minimal matching.
        – L. Scott Johnson
        CommentedJan 21, 2020 at 16:36
      0

      You can also use an awk-based approach:

      With GNU Awk:

      awk 'match($2,/^\/vol[[:print:]]*hdisk([^_]+)SVC/,v) {print(v[1])}' filename

      will match any line where the second column contains the pattern /vol<...>hdisk<...>SVC<...> and prints the string between hdisk and the firstSVC, as underscores _ have been excluded.

      Another approach (should be portable)

      awk 'split($2,v,/hdisk|SVC/)>1 {print v[2];next}' filename

      will use hdisk and SVC as field delimiters to split the second column into fields, and print the second field if more than one was found.

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