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I have a text file which looks like this

../pool/main/a/aalib/libaa1_1.4p5-44build2_amd64.deb

../pool/main/a/accountsservice/accountsservice_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/gir1.2-accountsservice-1.0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/libaccountsservice0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/acl/acl_2.2.52-3build1_amd64.deb

../pool/main/a/acl/libacl1_2.2.52-3build1_amd64.deb

../pool/main/a/acl/libacl1-dev_2.2.52-3build1_amd64.deb

../pool/main/a/acpid/acpid_2.0.28-1ubuntu1_amd64.deb

../pool/main/a/acpi-support/acpi-support_0.142_amd64.deb

../pool/main/a/adduser/adduser_3.116ubuntu1_all.deb

../pool/main/a/adium-theme-ubuntu/adium-theme-ubuntu_0.3.4-0ubuntu4_all.deb

../pool/main/a/advancecomp/advancecomp_2.1-1_amd64.deb

../pool/main/a/adwaita-icon-theme/adwaita-icon-theme_3.28.0-1ubuntu1_all.deb

../pool/main/a/aisleriot/aisleriot_3.22.5-1_amd64.deb

../pool/main/a/alabaster/python3-alabaster_0.7.8-1_all.deb

../pool/main/a/alembic/alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alembic/python3-alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alembic/python-alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alsa-driver/alsa-base_1.0.25+dfsg-0ubuntu5_all.deb

../pool/main/a/alsa-driver/linux-sound-base_1.0.25+dfsg-0ubuntu5_all.deb

I want to add space between last slash and name of deb package file e.g.

../pool/main/a/aalib/ libaa1_1.4p5-44build2_amd64.deb

I tried using sed but couldn't get it right.

sed 's_.*/_& _'

substitutes everything until the last slash (.*/, regexes are greedy) with itself followed by a space (&␣) in every line.

Example run

Provided your text file is called file and resides in the current working directory:

$ <file sed 's_.*/_& _'

../pool/main/a/aalib/ libaa1_1.4p5-44build2_amd64.deb

../pool/main/a/accountsservice/ accountsservice_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/ gir1.2-accountsservice-1.0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/ libaccountsservice0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/acl/ acl_2.2.52-3build1_amd64.deb

../pool/main/a/acl/ libacl1_2.2.52-3build1_amd64.deb

../pool/main/a/acl/ libacl1-dev_2.2.52-3build1_amd64.deb

../pool/main/a/acpid/ acpid_2.0.28-1ubuntu1_amd64.deb

../pool/main/a/acpi-support/ acpi-support_0.142_amd64.deb

../pool/main/a/adduser/ adduser_3.116ubuntu1_all.deb

../pool/main/a/adium-theme-ubuntu/ adium-theme-ubuntu_0.3.4-0ubuntu4_all.deb

../pool/main/a/advancecomp/ advancecomp_2.1-1_amd64.deb

../pool/main/a/adwaita-icon-theme/ adwaita-icon-theme_3.28.0-1ubuntu1_all.deb

../pool/main/a/aisleriot/ aisleriot_3.22.5-1_amd64.deb

../pool/main/a/alabaster/ python3-alabaster_0.7.8-1_all.deb

../pool/main/a/alembic/ alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alembic/ python3-alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alembic/ python-alembic_0.9.3-2ubuntu1_all.deb

../pool/main/a/alsa-driver/ alsa-base_1.0.25+dfsg-0ubuntu5_all.deb

../pool/main/a/alsa-driver/ linux-sound-base_1.0.25+dfsg-0ubuntu5_all.deb

To alter the file in-place, use:

sed -i 's_.*/_& _' file

What can be done is to use pattern grouping and take advantage of greedy globbing:

$ echo '../pool/main/a/aalib/libaa1_1.4p5-44build2_amd64.deb' | 

> sed -r 's/(^.*/)(.*.deb)/1 2/'

../pool/main/a/aalib/ libaa1_1.4p5-44build2_amd64.deb

The parenthesis correspond to integer items in replacement pattern. Thus first parenthesis will greedily match everything to the last slash and the second - everything after that

With input file in the question:

$ sed -r 's/(^.*/)(.*.deb)/1 2/' pool.txt

../pool/main/a/aalib/ libaa1_1.4p5-44build2_amd64.deb

../pool/main/a/accountsservice/ accountsservice_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/ gir1.2-accountsservice-1.0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/accountsservice/ libaccountsservice0_0.6.45-1ubuntu1_amd64.deb

../pool/main/a/acl/ acl_2.2.52-3build1_amd64.deb

../pool/main/a/acl/ libacl1_2.2.52-3build1_amd64.deb

<...and so on and so forth...>

And for good measure an awk version

$ awk -F/ '{ OFS="/"; $NF=" "$NF; print; }' /tmp/XXXX

[...]

../pool/main/a/acl/ libacl1_2.2.52-3build1_amd64.deb

../pool/main/a/acl/ libacl1-dev_2.2.52-3build1_amd64.deb

[...]

• 
  -F/ set the field separator to be /
  


• for each line of input, taken from /tmp/XXXX which contains your data
  
  
  
  
  • set output field separator to be / as well
  
  
  • 
    NF contains the number of fields, so $NF is the last field
  
  
  • Set the last field to be a space string concatenated with the original last field value
  
  
  • and print