The variable name PATH is already reserved for a different purpose: It lists all the possible locations searched to find commands not built into the shell. ls is such a command. Thus, when you change the value of PATH, you change the way the shell tries to look for the ls executable; unless the new … Read more
Use awk with a flag to trigger the print when necessary: $ awk ‘/abc/{flag=1;next}/mno/{flag=0}flag’ file def1 ghi1 jkl1 def2 ghi2 jkl2 How does this work? /abc/ matches lines having this text, as well as /mno/ does. /abc/{flag=1;next} sets the flag when the text abc is found. Then, it skips the line. /mno/{flag=0} unsets the flag … Read more
The main difference with shell config files is that some are only read by “login” shells (eg. when you login from another host, or login at the text console of a local unix machine). these are the ones called, say, .login or .profile or .zlogin (depending on which shell you’re using). Then you have config … Read more
If Machine A is a Windows box, you can use Plink (part of PuTTY) with the -m parameter, and it will execute the local script on the remote server. plink root@MachineB -m local_script.sh If Machine A is a Unix-based system, you can use: ssh root@MachineB ‘bash -s’ < local_script.sh You shouldn’t have to copy the … Read more
Print lines between PAT1 and PAT2 $ awk ‘/PAT1/,/PAT2/’ file PAT1 3 – first block 4 PAT2 PAT1 7 – second block PAT2 PAT1 10 – third block Or, using variables: awk ‘/PAT1/{flag=1} flag; /PAT2/{flag=0}’ file How does this work? /PAT1/ matches lines having this text, as well as /PAT2/ does. /PAT1/{flag=1} sets the flag … Read more
I was not aware of the award until today when some rookie tried to pin the UUOC on me for one of my answers. It was a cat file.txt | grep foo | cut … | cut …. I gave him a piece of my mind, and only after doing so visited the link he … Read more
To remove the line and print the output to standard out: sed ‘/pattern to match/d’ ./infile To directly modify the file – does not work with BSD sed: sed -i ‘/pattern to match/d’ ./infile Same, but for BSD sed (Mac OS X and FreeBSD) – does not work with GNU sed: sed -i ” ‘/pattern … Read more
Try mkdir -p: mkdir -p foo Note that this will also create any intermediate directories that don’t exist; for instance, mkdir -p foo/bar/baz will create directories foo, foo/bar, and foo/bar/baz if they don’t exist. Some implementation like GNU mkdir include mkdir –parents as a more readable alias, but this is not specified in POSIX/Single Unix … Read more
scp -r [email protected]:/path/to/foo /home/user/Desktop/ By not including the trailing “https://stackoverflow.com/” at the end of foo, you will copy the directory itself (including contents), rather than only the contents of the directory. From man scp (See online manual) -r Recursively copy entire directories
[I] have tried everything … except, say: awk -F- ‘BEGIN { OFS=”-” } { sub(/[0-9]/,””,$3); print }’ yourdata