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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

Reset to default
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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  • 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
    Commented Jan 21, 2020 at 16:23
  • 1
    @NileshChaturvedi sed -n 's/.*hdisk\(.*\)SVC.*/\1/p' filename
    – user313992
    Commented Jan 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
    Commented Jan 21, 2020 at 16:36
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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 first SVC, 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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