You're not giving grep any filenames, so it can't tell you any filenames. All it has is a list of undifferentiated lines coming from standard input (which it tells you, 'standard input'.)
How about this? awk can combine the head and tail into one program which still knows the filename:
If your version of find doesn't have '+' you can use ';' instead but '+' would be much more efficient.
I am trying to parse hundreds of shell scripts to determine how they related to each other. Ideally for every script, I would get an output of:
What other scripts it calls
What files it reads
Environment variables it accesses
Any ideas on how to do this?
TIA! (2 Replies)
I want to get filenames from the following input. How can I parse this in bash.
input data
-------------------------------------------------------------------
path=/aaa/bbb/filename1;/aaa/filename2;/aaa/bbb/ccc/ddd/filename3
-------------------------------------------------------------------... (13 Replies)
Hi,
I am wondering if there's a simpler way to extract the second occurrence of a word enclosed in that matches my search criteria.
Sample Input is as follows:
Error installing feature - com.er.nms.cif.ist.NoMatchingUpgra
Error installing feature -... (4 Replies)
I am new to the boards and to shell programming and have a requirement to name new files received with a unique sequence number. I need to look at a particular file pattern that exists and then to increment a sequence by 1 and write the new file.
Example of file names and sequence #
... (4 Replies)
I'm working in korn shell and have a variable which contains a string like:
aa_yyyymmdd_bbb_ccc_ddd.abc. I want to treat the _ and . as delimiters and parse the string so I end up with 6 values in variables that I can manipulate. My original plan was to use
var1=`echo $sting1 | cut -c1-c2` but... (9 Replies)
Hi, I need to parse a string, check if there are periods and strip the string.
For example i have the following domains and subdomains: mydomain.com, dev.mydomain.com
I need to strip all periods so i have a string without periods or domain extensions: mydomain, devmydomain.
I use this for... (12 Replies)
Hi Greetings
i have 1000 files (xmlfiles) and i need to find which file contain the string over 1000 file
all file end with txt
i tried with
grep -c "string" *.txt
i am getting an error
-bash: /bin/egrep: Argument list too long
i have put an script like below
#!/bin/bash
for line... (9 Replies)
Hi,
I would like to be able to parse out a substring matching a basic pattern, which is a character followed by 3 or 4 digits (for example S1234 out of a larger string). The main string would just be a filename, like Thisis__the FileName_S1234_ToParse.txt. The filename isn't fixed, but the... (2 Replies)
Please forgive my ignorance on scripting. I am trying to determine (via a script) if a certain string of characters is present . The string that I am looking for is a constant length.
Here is the string I am searching for:
Model_Type={t}, ModelName={m}
I need to determine if the above... (2 Replies)
Discussion started by: dlundwall
2 Replies
LEARN ABOUT MOJAVE
tail
TAIL(1) BSD General Commands Manual TAIL(1)NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus ('-') sign
or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default start-
ing location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number. The -F option is ignored if
reading from standard input rather than a file.
-n number
The location is number lines.
-q Suppresses printing of headers when multiple files are being examined.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
the file unless -q flag is specified.
EXIT STATUS
The tail utility exits 0 on success, and >0 if an error occurs.
SEE ALSO cat(1), head(1), sed(1)STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD June 29, 2006 BSD