Sed/Zeilen löschen

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Zeilen löschen

Löschen [d]

Der nachfolgende Aufruf löscht alle Zeilen ab der (einschließlich) 4.

  • bis zum Dateiende:
sed '4,$d' test.txt
 1 Der Aufruf des Stream Editors besitzt immer das Format:
 2 
 3 sed 'Kommando' Dateiname

Das Entfernen aller Zeilen, die mit einem Leerzeichen beginnen, erledigt dieser Aufruf: 

sed '/^ /d' test.txt
 10 Nummer Genau diese Zeile
 11 Start, Ende Alle Zeilen von "Start" bis "Ende"
 12 $ Symbolisiert die letzte Zeile
 13 RegEx Zeilen, die den Regulären Ausdruck enthalten
 14 1, RegEx Von Zeile 1 bis zur ersten Zeile, die RegEx enthält

Der delete-Befehl ist die Umkehrung des print-Befehls: Die bei der Bereichsauswahl (mittels RE oder explizit) selektierten Zeilen werden "gelöscht", also nicht ausgegeben. 

sed '/isst/d' < sed-test.txt
  • Zeilen, die "isst" enthalten, werden nicht ausgegeben
sed '3d' < sed-test.txt
  • die dritte Zeile wird nicht ausgegeben

Beispiele

Lösche die Nte Zeile

‘Nd’ deletes the Nth line and prints the other lines. 

sed ‘Nd’ filename

It reads the first line and places in its pattern buffer.

  • Check whether supplied command is true for this line, if true, deletes pattern space buffer and starts next cycle. i.e Read next line.
  • If supplied command doesnt true, as its normal behaviour it prints the content of the pattern space buffer.

For example, 3d deletes 3rd line and prints other lines as shown below. 

sed 3d thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc.

Delete Starting from 3rd line and every 2nd line from there.

sed '3~2d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
4.
  • Security (Firewall, Network, Online Security etc)
6.
  • Cool gadgets and websites
8.
  • Website Design
10.Windows- Sysadmin, reboot etc.

Delete from 4th to 8th line from file.

sed '4,8d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
9.
  • Software Development
10.Windows- Sysadmin, reboot etc.

Delete the last line from input.

sed '$d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
4.
  • Security (Firewall, Network, Online Security etc)
5.
  • Storage
6.
  • Cool gadgets and websites
7.
  • Productivity (Too many technologies to explore, not much time available)
8.
  • Website Design
9.
  • Software Development

Delete the line which matches the given pattern from input.

For example, the below command deletes the line which matches with “Sysadmin”. 

sed /Sysadmin/d thegeekstuff.txt 
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
4.
  • Security (Firewall, Network, Online Security etc)
5.
  • Storage
6.
  • Cool gadgets and websites
7.
  • Productivity (Too many technologies to explore, not much time available)
8.
  • Website Design
9.
  • Software Development

Deletes the line from which matches the given pattern to end of the file.

sed '/Website/,$d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
4.
  • Security (Firewall, Network, Online Security etc)
5.
  • Storage
6.
  • Cool gadgets and websites
7.
  • Productivity (Too many technologies to explore, not much time available)

Deletes the line from which matches the given pattern and 2lines next to that.

sed '/Storage/,+2d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
4.
  • Security (Firewall, Network, Online Security etc)
8.
  • Website Design
9.
  • Software Development
10.Windows- Sysadmin, reboot etc.

Delete blank Line from a file using sed

You can also remove blank lines with sed.
  • The following sed example shows how to use sed and remove blank lines.
sed '/^$/d' thegeekstuff.txt 
1.
  • Linux - Sysadmin, Scripting etc.
2.
  • Databases - Oracle, mySQL etc.
3.
  • Hardware
4.
  • Security (Firewall, Network, Online Security etc)
5.
  • Storage
6.
  • Cool gadgets and websites
7.
  • Productivity (Too many technologies to explore, not much time available)
8.
  • Website Design
9.
  • Software Development
10.Windows- Sysadmin, reboot etc.
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